Topic prostaglandin analogues are used for the treatment of glaucoma. Uniocular increase in length, thickness, and pigmentation of the lashes were described by Johnstone in 1997 by patients using latanoprost in one eye.[184] There are reports of a response of alopecia of eyelashes to cutaneously administered latanoprost,[185,186] though others report limited success.[187] Eyelash growth has also been reported following bimatoprost 0.03% topically to the base of the eyelashes in healthy individuals[188–190] and in individuals with alopecia areata.[191] Bimatoprost ophthalmic solution 0.03% is the only Food and drug administration (FDA)-approved product to safely and effectively enhance the growth of a patient's own eyelashes.[192,193]
Some cancer chemotherapy drugs cause temporary hair loss, which affects all body hair. Along with the loss of scalp hair, people undergoing chemotherapy also commonly lose their eyebrows and eyelashes. Chemotherapy drugs that frequently cause hair loss include paclitaxel, 5-fluorouracil, carboplatin, cisplatin, actinomycin-D, bleomycin, vincristine, cyclophosphamide, altretamine, etoposide, docetaxel and doxorubicin. Hair loss typically begins 2 to 3 weeks after the start of chemotherapy. Lost eyebrow hair regrows in the weeks to months following completion of treatment.
Thinning hair, noticeable bald spots, receding hair line, large clumps of hair showing up in your hair brush or shower drain, these are typically things you hear about from men, not women. More and more though, we are contacted by women who are experiencing hair loss who want to know if this is a sign of something wrong with their hormones and how they can fix the problem. Fortunately, hair loss is not a sign of infertility, but is a side effect of hormonal imbalance which can impact your fertility. 

The normal cycle of hair growth lasts for 2 to 6 years. Each hair grows approximately 1 centimeter (less than half an inch) per month during this phase. About 90 percent of the hair on your scalp is growing at any one time. About 10 percent of the hair on your scalp, at any one time, is in a resting phase. After 2 to 3 months, the resting hair falls out and new hair starts to grow in its place.
Male pattern baldness (MPB) has a distinctive shape. The front hairline recedes, especially at the sides, forming an M shape. This is frontal baldness. The crown of the head, also known as the vertex, becomes bald as well. Eventually the two areas join into a “U” shape. MPB can even extend to chest hair, which can thin as you age. Oddly enough, hair in different locations on the body can react differently to hormonal changes. For instance, facial hair growth can improve while other areas become bald.
This manifests in childhood with chronic lower eyelid dermatitis and is often associated with other types of allergic disorders.[36,37] The ocular features are eyelid dermatitis, Dennie-Morgan fold (an infraorbital fold or line due to lid edema in atopic dermatitis), keratitis, and a frequent association with keratoconus and cataracts. Loss of lateral third of eyebrows (Hertoghe sign)[38] is seen in atopic dermatitis due to constant scratching and rubbing. 

Stress: Emotional and physiological stress can trigger a few hair loss conditions that can affect your eyebrows. Telogen effluvium, for instance, can cause your hair to shed. Then there’s trichotillomania, which is a psychiatric condition caused by stress that is characterized by the urge to pull out your own hair (which could be from your eyebrows, eyelashes or scalp).
Alopecia areata is a patchy hair loss associated with immune disturbances. In this condition the immune system attacks the hair follicles thereby impairing hair growth. It is more likely to occur in people with other immune-related disorders and has also been linked to psychological stress as well as with certain drugs like some types of ARVs used for HIV treatment. Alopecia areata does not only affect the scalp as commonly thought. The eyebrows and beard area, as well as hairy parts anywhere on the body may be affected.
Various techniques have been described over the years. Nylon implants were used by some people. Now, they are banned in many countries because of sequelae-like scarring and infection. Follicular unit transplantation has been found to give very good results[195] and is now the procedure of choice for most types of hair transplantation. The details of the procedure with respect to eyebrow and eyelash reconstruction will be discussed here.
Blepharitis is a chronic primary eyelid inflammation. It is fairly common in occurrence and being a condition with remissions and relapses, results in a decreased quality of life if adequate measures are not taken. Chronic blepharitis is the most common condition associated with madarosis.[10] Though there are various ways of classifying blepharitis, the most useful is the one proposed by Wilhelm,[24] wherein blepharitis can be classified based on whether there is a predominant involvement of the part of the eyelid anterior to the gray line (anterior blepharitis), or posterior to the gray line (posterior blepharitis). The gray line is an imaginary line dividing the eyelid into an anterior part consisting of the skin and muscle, and a posterior part consisting of the tarsus and conjunctiva.
This is most commonly found in women wearing ponytails, tight braids or any hairstyles that typically pull on hair with excessive force. In addition, rigorous brushing, heat styling and rough scalp massage can damage the cuticle, the hard outer casing of the hair. This causes individual strands to become weak and break off, reducing overall hair volume.
Eyebrow thinning that manifests in irregular patches, especially accompanied by red and itchy skin, may indicate atopic dermatitis. This condition—commonly called eczema—can occur just about anywhere on the body and is usually hereditary. People with atopic dermatitis may be more sensitive to topical irritants, but eczema just from topical irritants is called allergic contact dermatitis or irritant contact dermatitis. While you wait on the appointment with your dermatologist, you can help ease eczema around the eyebrows by switching to mild soaps or a soap-free facial cleanser, and applying an intensive facial moisturizer within three minutes after bathing.

Postpartum hair loss is related to the drop in estrogen experienced after giving birth. During pregnancy, the body has higher levels of estrogen (and progesterone) and estrogen increases hair’s “resting phase,” or the time hair stays on your head before naturally falling out (which is what accounts for the 100 or so hairs that healthy heads shed every day). When estrogen drops after pregnancy, all the hair that had been “resting” starts to shed. Post-pregnancy hair loss is usually temporary, lasting for several months.
The first thing you'd want to try is to talk to your doctor about stopping the medicine -- ask if there's a substitute. If you can't find a substitute for the medication and you must take it, then you could consider filling in your eyebrows. You can find brow products at any local drugstore. YouTube has many, MANY brow tutorials you could learn from.

These are only a few of the common myths heard by physicians and other hair loss specialists on a daily basis. The American Hair Loss Council suggests that you first have your hair loss diagnosed by a competent dermatologist who sees hair loss patients on a regular basis. Once you know the diagnosis you will have a better understanding of exactly which treatment option may be best for you.
For other women, the problem with estrogen dominance is that they’re also experiencing lower levels of progesterone relative to estrogen—and progesterone helps protect hair follicles from the hair-thinning effects of testosterone, DHT, and estrogen. Evidence suggests that progesterone may act as an aromatase inhibitor and other research suggests that the genes involved in aromatase activity are implicated in female hair loss.
This article was very informative for me. I am a 56 yr. old male struggling with high estrogen levels and low T. My last blood test taken last week my estrogen level was 100 and my T was 700 its climbing because I am taking testosterone inj. Twice a week at 50mg per inj. I’m also taking Anastrozole 1/10 tab 5 days a week. I just started on that. Its only been 2 days for the estrogen blocker. My belly fat is increasing and I’m feeling and looking extremely bloated. I’m depressed because of the weight gain and the way I now look. My healthy weight is 153 I’m 5’8″ but now I’m 178lbs. I’m also constipated and feel there is a lot of food not passing through, please let me know which part of this is normal and will the Anastrozole start working gradually and cut my belly fat out? My diet is high fiber, low carbs. I am working on working out more often. I’m a non smoker and non drinker.
The normal cycle of hair growth lasts for 2 to 6 years. Each hair grows approximately 1 centimeter (less than half an inch) per month during this phase. About 90 percent of the hair on your scalp is growing at any one time. About 10 percent of the hair on your scalp, at any one time, is in a resting phase. After 2 to 3 months, the resting hair falls out and new hair starts to grow in its place.
Another reason that you have thinning eyebrows might be low thyroid (which is called hypothyroidism. The thyroid gland controls the rate of use of energy sources, protein synthesis by producing thyroid hormones. I the thyroid gland does not produce enough hormones, you might feel tired, freeze in the cold, gain weight or lose your hair. The most common cause of hypothyroidism is iodine deficiency.

Diet and supplements. Hair loss caused by a vitamin deficiency or eczema can be addressed with a healthy diet and targeted vitamins and supplements. Make sure you’re getting plenty of vitamins A, B and D by eating leafy greens, nuts and seeds, fish, eggs and whole grains. If you have any gaps in your diet, take the necessary supplements to promote hair growth. Your doctor can give you direction about what to eat and take for support.

The normal cycle of hair growth lasts for 2 to 6 years. Each hair grows approximately 1 centimeter (less than half an inch) per month during this phase. About 90 percent of the hair on your scalp is growing at any one time. About 10 percent of the hair on your scalp, at any one time, is in a resting phase. After 2 to 3 months, the resting hair falls out and new hair starts to grow in its place.
The eyebrows are two-arched eminences of skin situated above the orbital regions.[3,4] The hairs of the eyebrows are short, thick. and stiff and are set obliquely. The diameter of eyebrow hair is normally thinner than scalp hair in Asians, and the scalp hair in thinner in Caucasians.[5] The eyebrows can be roughly divided into three parts. The medial third is usually below the orbital margin with the hairs in this region oriented vertically. The middle third lies along the orbital margin with hairs oriented obliquely or horizontally. The lateral third usually lies above the orbital margin.[3] Eyebrow hair normally tends to be less dense laterally than medially; thus, hair loss from any cause is apt to be more obvious in the lateral portion.[6]
The different phases may last for varying periods of times from several years in anagen, to a few months in telogen or several weeks in anagen. Fortunately not all hair follicles are in the same phase at the same time. So the majority of the follicles will be in anagen phase, while a smaller amount will be in the catagen phase and a few follicles will be in the telogen phase. This ensures that there is always some hair present even when the follicle is not active and the hair is not growing.
Ever since Cara Delevingne set the trend for thick eyebrows (although women on the eastern side of the Prime Meridian have been keeping their eyebrows luscious and strong since the dawn of time), the quest to keep your eyebrow hair supremely groomed and in shape has become the primary beauty concern of all women. So now that eyebrows have come into the razor sharp focus of beauty standards that women (again) need to adhere to, it can come as quite a shock for some when they start losing their eyebrow hair. One day you’re lovingly brushing out your thick luscious eyebrows and the next moment you find yourself desperately filling them in with every eyebrow pencil you can get your hands on. You’re confused. You’re anxious. You don’t know what’s going on. And you’re trying out every random hack that the internet spews at you to stop losing your eyebrow hair. Lady, you need to calm down for a second. First, figure out why you’re losing your eyebrow hair in the first place. Let’s look at a few possible causes of your eyebrow hair loss.
Hansen's disease, also known as leprosy, is an infection of the skin and nerves caused by the bacterium Mycobacterium leprae. The disease often affects the skin of the eyebrow region, leading to loss of sensation and permanent loss of the eyebrow hairs. There are numerous other rare and uncommon causes of eyebrow hair loss, including vitamin A toxicity, nutritional disorders and other dermatological disorders. If you experience loss of eyebrow hair, see your doctor to evaluate the cause and to discuss a treatment plan.
There are numerous nonsurgical treatments that when combined, can offer significant hair improvements. Dr. Yaker’s TCHR Volumizing Glycolic Acid Shampoo and Conditioner help restore vitality to the hair by deep cleaning the scalp and reestablishing lost moisture content and physiological pH to the scalp and hair. Dr. Yaker has also formulated his own oral supplement, which is a blend of Aminoplex hair repair vitamins. This is made up of amino acids (building blocks of protein) that produce keratin, which makes up close to 97% of our hair. In addition, Dr. Yaker’s specially compounded FDA approved topical medication, Minoxidil (brand name: Rogaine®), is clinically proven to help slow down, stop and even reverse hair loss in women. Other nonsurgical therapies offered are Low Level Laser Therapy (LLLT) using the advanced LaserCap®, and Platelet Rich Plasma (PRP) with placenta-derived extracellular matrix therapy to help restore thinning hair. Lastly, Dr. Yaker offers scalp and facial micropigmentation where permanent ink is applied to the skin, creating micro dots that replicate the natural appearance of hair. This is used for the scalp and eyebrows.
"Dr. Yaker and his staff are friendly, welcoming and professional. Everyone greets you with a smile and remembers your name. His offices and procedure rooms are always clean. Dr. Yaker is extremely knowledgable and willing to spend as much time answering questions and discussing options with his patients as they desire. I use Dr. Yaker's hair vitamins and shampoo and conditioner and have definitely seen positive results. So far, I have had two PRP treatments done by Dr. Yaker and he and his staff always take care of me and make me feel comfortable. I have recommended him to many of my friends and family. He's the best!" 

At The Hair Wellness Group we cater to those desiring to maintain the health and integrity of their hair.  We offer both General Hair Care services as well as Customized Hair and Scalp Therapy Treatments. We service men and women and all ethnicities…To us hair is hair! We are keenly interested in working with our clients to find the best Hair Care Regimen along with Hair Products and Wellness Products for their needs.
What’s more likely is that telogen effluvium is at play (again). In addition to hormone fluctuations, this type of hair loss happens when there is a drastic dip in protein in the diet or sudden weight loss. For example, if you are sick and can only consume liquids for a month. “If you have protein levels that drop dramatically, your hair follicles go into hibernation, and you can see sudden acute hair loss that shows up three to six months later,” says Dr. Katta.
Reduce stress. When you are stressed, your body starts shutting down processes that aren’t necessary for survival. This shutdown can occur with physical stressors, like surgery or an illness, and emotional stress, which often manifests as physical symptoms. Loss may occur up to three months after the stressful event and may take another three to grow again.[24]
Physicians such as dermatologists and plastic surgeons have long recommended essential vitamins and supplements for hair growth to women and men. Now read why top medical experts including Dr. Craig Ziering and Dr. Steven Dayan have been telling their patients for years about Viviscal hair growth supplements to help grow thicker, longer and healthier looking hair.
Madarosis has also been described in phthiriasis of the eyelid. Phthiriasis palpebrarum is the term used to denote infestation of the eyelashes by the pubic louse or Phthirus pubis, also known as crab louse. The parasite is usually transmitted by sexual contact or through fomites. Heavy infestation may result in involvement of axillae, eyebrows, and scalp. When eyebrows and lashes are involved, blue-gray macules or maculae caeruleae may be found on the shoulders, arms, and trunk.[89] The louse can be identified under the microscope as having a wide body and strong second and third pair of legs.[90]
Lichen planopilaris and frontal fibrosing alopecia inflammatory conditions, in which the inflammation destroys the hair follicle, can cause a scar or permanent hair loss (usually present as red patches with redness and scale around each hair follicle). In the very advanced stages, they may appear as smooth, bald patches where the hair follicles have been destroyed. Androgenetic hair loss is another non-scarring type. The most common type of hair loss, it is due to the complex interplay of genes, hormones, and age.
Prevention is better than cure, so they. Can you really prevent or stop losing your brows? Is there a way to prevent eyebrow hair loss? Depending on the cause, it is possible to prevent them. You need to stop the causative reason. For instance, if you have been over plucking, tweezing or threading, you need to stop it until your eyebrows have grown again. If your eyebrow loss is caused by some medications you are using, whenever possible, stop using them. However, if you are attending chemotherapy session for instance, it is not practical to stop your sessions as a ways of preventing this loss.

Contact dermatitis causes skin inflammation and when severe it can affect the hair follicles as well. It can either be due to some irritant making contact with the skin of the eyebrows or due to a substance to which a person has an allergy. This gives rise to the two types of contact dermatitis – irritant contact dermatitis or allergic contact dermatitis. Substances that could cause contact dermatitis at the eyebrow includes eye makeup including eyebrow pencils, hair removal creams and waxes, other cosmetics, hair dyes and scalp hair styling products.


Male pattern hair loss has been established as androgen-dependent because it is associated with changes in the androgen receptor and responds to antiandrogen therapy (Ellis et al., 2002). With FPHL, genes that encode aromatase, which converts testosterone to estradiol, are also implicated (Yazdabadi et al., 2008, Yip et al., 2009). The process of androgen biosynthesis is depicted in Figure 1.
Scalp hair loss may be a common complaint among men and women, but in my practice, loss of eyebrow hair is a major concern among my female patients. Because eyebrows frame the face, hair loss in this area can dramatically change one's appearance, and since eyebrow hair loss is not easily concealed, it can be, for some women, an even more devastating loss than scalp hair loss.

Eyebrows protect the eyes from sweat that trickles down the forehead. They also protect the bony ridges above the eyes. In addition to the above, the eyebrows play a very important function in facial expression and body language. Eyelashes protect the eyeball from small foreign bodies and irritants and stimulate the closing reflex. Both eyebrows and eyelashes play a very important cosmetic function, and thus contribute greatly to the self esteem of an individual.[9]


Reduce stress. When you are stressed, your body starts shutting down processes that aren’t necessary for survival. This shutdown can occur with physical stressors, like surgery or an illness, and emotional stress, which often manifests as physical symptoms. Loss may occur up to three months after the stressful event and may take another three to grow again.[24]
Madarosis is a clinical sign that has become pathognomonic of leprosy in countries like India. However, this apparently benign clinical sign has wider ramifications in many systemic and dermatological disorders. Hence, establishing a proper diagnosis and appropriate management is mandatory. Though management of the primary disease results in regrowth of eyebrows and eyelashes, many require surgical management. Thus, the management of a patient with madarosis requires a coordinated effort from the dermatologist, ophthalmologist, internist, and reconstructive surgeon.
If you’re experiencing hair loss, topical treatments like minoxidil (Rogaine) and others tend to only be partially effective, if they are effective at all; they don’t address the root causes of hair loss; they target androgenic alopecia (which only accounts for some cases of hair loss); and they come with a host of unpleasant side effects—side effects that can worsen the aesthetic problem you were hoping to fix. Rogaine can cause hair to grow in different colors and textures than the surrounding hair and can cause unwanted hair to grow on your cheeks and forehead.

There is pilosebaceous inflammation[45] with both scarring and non-scarring alopecia depending on the degree of inflammation. Most commonly, there is involvement of the head and neck, though widespread involvement is also seen. Eyebrow loss is a prominent finding and may be the presenting symptom when the eyebrow region is involved in the acute benign form of follicular mucinosis.[46]
Ever since Cara Delevingne set the trend for thick eyebrows (although women on the eastern side of the Prime Meridian have been keeping their eyebrows luscious and strong since the dawn of time), the quest to keep your eyebrow hair supremely groomed and in shape has become the primary beauty concern of all women. So now that eyebrows have come into the razor sharp focus of beauty standards that women (again) need to adhere to, it can come as quite a shock for some when they start losing their eyebrow hair. One day you’re lovingly brushing out your thick luscious eyebrows and the next moment you find yourself desperately filling them in with every eyebrow pencil you can get your hands on. You’re confused. You’re anxious. You don’t know what’s going on. And you’re trying out every random hack that the internet spews at you to stop losing your eyebrow hair. Lady, you need to calm down for a second. First, figure out why you’re losing your eyebrow hair in the first place. Let’s look at a few possible causes of your eyebrow hair loss. 

Madarosis has also been described in phthiriasis of the eyelid. Phthiriasis palpebrarum is the term used to denote infestation of the eyelashes by the pubic louse or Phthirus pubis, also known as crab louse. The parasite is usually transmitted by sexual contact or through fomites. Heavy infestation may result in involvement of axillae, eyebrows, and scalp. When eyebrows and lashes are involved, blue-gray macules or maculae caeruleae may be found on the shoulders, arms, and trunk.[89] The louse can be identified under the microscope as having a wide body and strong second and third pair of legs.[90]

Cyproterone acetate works in several ways. It not only competitively blocks DHT from binding to its receptors at target tissue (Gilman et al., 1990), but it is also a progestogen that lowers testosterone levels by decreasing the release of luteinizing and follicle-stimulating hormones through pituitary-mediated supression (Gilman et al., 1990, Varothai and Bergfeld, 2014). An open intervention study of 80 women who received treatment with spironolactone (200 mg daily) or cyproterone acetate (50 mg daily or 100 mg for 10 days per month if premenopausal) showed that three of four patients demonstrated an improvement or stabilization of their disease with no difference of effect between the therapies received (Sinclair et al., 2005).

There is pilosebaceous inflammation[45] with both scarring and non-scarring alopecia depending on the degree of inflammation. Most commonly, there is involvement of the head and neck, though widespread involvement is also seen. Eyebrow loss is a prominent finding and may be the presenting symptom when the eyebrow region is involved in the acute benign form of follicular mucinosis.[46]
Cyproterone acetate works in several ways. It not only competitively blocks DHT from binding to its receptors at target tissue (Gilman et al., 1990), but it is also a progestogen that lowers testosterone levels by decreasing the release of luteinizing and follicle-stimulating hormones through pituitary-mediated supression (Gilman et al., 1990, Varothai and Bergfeld, 2014). An open intervention study of 80 women who received treatment with spironolactone (200 mg daily) or cyproterone acetate (50 mg daily or 100 mg for 10 days per month if premenopausal) showed that three of four patients demonstrated an improvement or stabilization of their disease with no difference of effect between the therapies received (Sinclair et al., 2005).
Physicians such as dermatologists and plastic surgeons have long recommended essential vitamins and supplements for hair growth to women and men. Now read why top medical experts including Dr. Craig Ziering and Dr. Steven Dayan have been telling their patients for years about Viviscal hair growth supplements to help grow thicker, longer and healthier looking hair.
Giorgos Tsetis: Consumers are lost, and that's the sad part about it. You have a serious problem, you go on the internet and see thousands of products making similar claims, and you can't choose. Most likely, you're going to try the cheapest product with the most compelling claims, realize it doesn't work, and only add further stress. When an industry is not properly regulated, this is the result. Education is such a big component of what we do. Reverse engineering a solution requires a tremendous amount of time and research. What we did was connect all these dots reading hundreds of pages of scientific literature. Education, when it comes to this, is broken into education for the physicians and education for the consumers. It's always hard to educate, because what you're really doing is changing behavior. Slowly but surely, we're actively changing the mindset of physicians and consumers, evolving the way they view and treat hair loss. That is huge, and one of the key reasons Unilever invested in the company. What we did was raise the bar by introducing a new category in the medical channel that remained untapped. That's how we disrupted the market, where now you see hundreds of doctors using Nutrafol as a trusted alternative for men and women. We also have several writers in the company who imagine how we can make this world simple and digestible for people. We want consumers to make smart choices.
Hair loss in women can be related to genetics, hormones and age. Androgenetic alopecia, also known as female pattern hair loss, is one of the most common causes of hair loss in women. Hair loss in women may be caused by a serious medical condition that needs proper attention and treatment as early as possible. The hair loss patterns in women usually differ from those in men. Find out more about hair loss in women.
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The photo included here shows an example of one condition which could affect the eyebrows, eyelashes, facial hair and pubic hair. This is a type of thinning hair found in women that are regularly seen at Sussex Trichology in West Sussex. These symptoms obviously cause the sufferer much distress as the appearance has dramatically altered the hairline since the eyebrows define the face. Shuna Hammocks, our Consultant Trichologist, is able to diagnose your condition and discuss it at length and then design a treatment plan for you. It may be suggested that you attend the clinic for hair treatments which involve a combination of creams, steam and massage.
Sara Gottfried, MD is the New York Times bestselling author of the new book, Younger: A Breakthrough Program to Reset Your Genes, Reverse Aging, and Turn Back the Clock 10 Years. Her previous New York Times bestsellers are The Hormone Cure and The Hormone Reset Diet. After graduating from Harvard Medical School and MIT, Dr. Gottfried completed her residency at the University of California at San Francisco. She is a board-certified gynecologist who teaches natural hormone balancing in her novel online programs so that women can lose weight, detoxify, and slow down aging. Dr. Gottfried lives in Berkeley, CA with her husband and two daughters.
Thyroid Dysfunction: Since the thyroid gland regulates many body functions by releasing hormones, any disruption in its functioning can cause loss of hair, including eyebrow hair. If your thyroid is underactive, it could cause you to lose the outer third of your eyebrow. The only way to treat thyroid dysfunction is through medication. However, there’s still no guarantee that your eyebrow hair will grow back.
This manifests in childhood with chronic lower eyelid dermatitis and is often associated with other types of allergic disorders.[36,37] The ocular features are eyelid dermatitis, Dennie-Morgan fold (an infraorbital fold or line due to lid edema in atopic dermatitis), keratitis, and a frequent association with keratoconus and cataracts. Loss of lateral third of eyebrows (Hertoghe sign)[38] is seen in atopic dermatitis due to constant scratching and rubbing.
Not only that, but plucking, waxing, or threading can also lead to permanent eyebrow loss, ingrown hairs, and infections. With repeated trauma to the hair follicle, your follicle can become damaged and scarred. If this occurs, your hair may never grow back again. Make sure to be extra careful to only pull out the hairs that you want to remove when you are plucking your brows. You should also wash your tweezers with alcohol before you start plucking or seek treatment at a reputable salon to prevent infections.
Another reason that you have thinning eyebrows might be low thyroid (which is called hypothyroidism. The thyroid gland controls the rate of use of energy sources, protein synthesis by producing thyroid hormones. I the thyroid gland does not produce enough hormones, you might feel tired, freeze in the cold, gain weight or lose your hair. The most common cause of hypothyroidism is iodine deficiency.
Like with low thyroid, there can be a myriad of imbalances at play with PCOS related hair loss making it a complex issue that’s often written off as merely high testosterone. While androgen excess and hypersensitivity of the hair follicles to these hormones are part of the issue, these are other contributing factors to PCOS related hair loss as well: 

Infestation with the mite D. folliculorum which inhabits the eyelashes is well known. Two species are known to inhabit human beings—D. folliculorum and Demodex brevis.[29] It might either be asymptomatic or may cause symptoms of blepharitis. Kemal et al. report an overall prevalence of 27.4% in their study group.[88] Gao et al. have reported a 100% prevalence of the mite when there is cylindrical dandruff.[29] Patients with demodicosis can develop madarosis.[29]
Additionally, two other considerations are important for a patient who receives treatment for FPHL. First, there is a set of reasonable expectations in patients. Maintaining the current hair density can be considered a successful treatment because women tend to have further thinning as they age (Harfmann and Bechtel, 2015). Second, it is important to ensure that patients understand that progress is slow, and months or years can be required to see a significant improvement (Boersma et al., 2014, Yeon et al., 2011). In our practice, we wait at least 6 months to assess treatment efficacy.
 Because too much insulin (which is released by the pancreas in large amounts when we consume foods high in sugar or refined flour) signals the ovaries to produce more testosterone, and because an overload of testosterone increases the likelihood that our bodies may make more of the hair-thinning hormone DHT, work to keep blood sugar steady by eating fiber-rich whole foods.  In addition, the Saw Palmetto herb has shown promise for its ability to block the conversion of testosterone into DHT, so it may help androgen-related hair loss. To date, research on saw palmetto for hair loss is limited, but the research that has been done is promising.

There is some evidence of a link between baldness and prostate cancer and other diseases. Harvard Medical School reports that men with vertex baldness have 1.5 times more of a risk of developing prostate cancer than men without bald spots. The risk of coronary artery disease is also more than 23 percent higher in men with vertex bald spots. Investigations are ongoing as to whether there is a link between DHT levels and metabolic syndrome, diabetes, and other health conditions.
Thyroid hormone receptors were detected in both dermal and epithelial compartments of the human pilosebaceous unit.[48] T4 and T3 decrease the apoptosis of hair follicles and T4 prolongs the duration of anagen in vitro.[49] Thyroidectomy delays initiation of anagen. Administration of thyroxine advances anagen, initiation of which is however delayed once toxic doses are given. Therefore, ratio of telogen to anagen hairs is increased in hypothyroidism as well as hyperthyroidism.[50] Thus, the hair follicles are affected in thyroid disorders, and madarosis is caused due to disturbances in hair cell kinetics. Hypothyroidism is associated with generalized hair loss probably due to coarse, dull, and brittle hair with reduced diameter.[51] The eyebrows and eyelashes may also be lost. Loss of lateral one-third of eyebrows known as Hertoghe sign[38] is a characteristic sign of hypothyroidism.[52] Some people also refer to it as Queen Anne's sign,[53] after Anne of Denmark whose portrait with shortened eyebrows has been interpreted by some as indicative of the presence of goiter, even though such a fact has not been proved by any known sources of information. Madarosis may even be the presenting sign in hyperthyroidism.[21] In hyperthyroidism, there is thinning with breaking off and shortening of hair.[54] Madarosis can also occur in hypopituitarism, hypoparathyroidism,[21] and hyperparathyroidism.[55]
Hormones don’t just affect your mood, they are also common culprits of hair loss. A hormone imbalance caused by thyroid disease, pregnancy, menopause, or hormone medication (like birth control pills) can lead to eyebrow loss. Thankfully, once you identify the source of the hormone imbalance and address the problem, your hair will likely grow back naturally.
The process takes about two hours to complete, but you’ll need to go in for a touch up about once a year after the initial appointment (and possibly a second follow-up). Microblading costs between $500 and $1,000, and the results should last for one to three years. Your natural brow hair will continue to grow, but you likely won’t need to get waxed as often. “Most people find their regular maintenance decreased because they have the shape they want after microblading,” Studabaker says. 

Seborrheic dermatitis is a condition where you have itchiness in the eyebrows.. like serious, serious itchiness. First of all, if you think you have this: see a derm, stat. You need a derm to confirm (can I trademark that saying?), and you definitely need a derm for the prescription. A dermatologist will tell you to treat the seborrheic dermatitis with a combination of desonide cream and ketoconazole cream twice daily for one week. Or, they may tell you to use a ketoconazole shampoo to control the problem.
Hansen's disease, also known as leprosy, is an infection of the skin and nerves caused by the bacterium Mycobacterium leprae. The disease often affects the skin of the eyebrow region, leading to loss of sensation and permanent loss of the eyebrow hairs. There are numerous other rare and uncommon causes of eyebrow hair loss, including vitamin A toxicity, nutritional disorders and other dermatological disorders. If you experience loss of eyebrow hair, see your doctor to evaluate the cause and to discuss a treatment plan.

Women using oestrogen supplementation or taking birth control pills will also experience hair loss when they cease supplying their body with extra oestrogen. These forms of hair loss may be temporary but this, however, does not mean that there is no link between oestrogen and permanent hair loss. Scientists have noted up to 30 hormones that could play a role in female pattern hair loss – the genetic kind of hair loss – and oestrogen, whilst poorly explored, may be one of them. It’s alright if the excess hairs are the ones that are lost but when normal hair falls out, there’s a problem. 

Testosterone replacement is becoming popular for men. Cotsarelis warns that this may accelerate hair loss. Propecia might help -- but because it prevents testosterone breakdown, it might affect the dose of male hormone replacement therapy. Cotsarelis warns men taking both Propecia and testosterone replacement to make sure their doctor carefully monitors their testosterone levels.
So, if you have a similar paranoia—fear not! Losing strands is totally normal. But Dr. Wexler is quick to add that things like over-tweezing (it causes scarring to the follicles), waxing, severe weight-loss, stress, excessive touching, hormonal changes, and auto immune disease can cause irregular brow hair loss. If you believe your case may be extreme, it's best to see a specialist.
Giorgos Tsetis: Another reason Unilever was inspired to partner with us is that we really target three channels. Direct-to-consumer is one, then we target physician channels and salon channels; which are the hardest to convince. There's liability involved, so there's no doctor in the world who is going to recommend or endorse a product they don't believe in. We have about 350-400 physicians currently selling the product. A large amount of these doctors are thought-leaders or experts in the space, so they are known to speak about this issue on a world stage when it comes to new innovations. We also have each of the top 20 hair salons in the country carrying the product. There's a ton of celebrities who use the product as well. It is a premium product, but we've still made it affordable for people. When you look at other products on the market, our price point is comparable. We're also working on special programs for people in need who can't normally afford the product. If somebody is motivated, serious and really needs it -- we work to make sure they can get the product, and seek to serve as many people as possible.
Insulin regulation is also a big factor in hair health, as an imbalance can lead to various hormonal effects. Insulin helps to regulate blood sugar levels, which effects fat storage and hormone balance. Fat storage and hormone balance play a role in hair growth because fat storages will secrete excess estrogen in the body, and can desensitize hormone signals.  
It’s natural for estrogen levels to fluctuate throughout a woman’s life, but drastic drops can disrupt the hair growth cycle and cause telogen effluvium. For example, during pregnancy, a woman’s estrogen levels are at their peak. Fewer hair follicles enter the telogen stage of the hair cycle, so hair looks thicker than usual. A few months after pregnancy, however, estrogen levels drop and the excess hair falls out. While totally normal, this type of telogen effluvium can be very upsetting for new mothers.
It is known that during pregnancy, because of an increased level of estrogen, there is a tremendous growth of new hair. However, during menopause it is noticeable that the reduced level of estrogen hormone tends to cause hair loss. When the estrogen hormone levels tend to drop, the hair follicles fall under the influence of the male sex hormone or the testosterone, which cause the shortening of the growth phase of hair. Subsequently there is a noticeable hair loss. This hair loss caused due to the drop down of estrogen levels may cause patchy hair loss or complete baldness.
If you’ve gotten through this list and still don’t know what’s going on, it’s time to talk to your doc. Unfortunately, madarosis–typically used to mean the loss of eyelashes, but also referring to the loss of brows–may be due to many, many things, including a number of vision and life-threatening conditions, like herpes zoster, leprosy, HIV/AIDS, trachoma, malignant eyelid tumors, discoid lupus, scleroderma, and hypothyroidism (Khong, Casson, Huilgal, Selva; Survey of Opthamology, 2006). Brow and lash loss are both indicators of underlying diseases, so yes get to your doc stat.
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