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]
It is perfectly normal for people to shed 50 to 100 hairs per day. This generally doesn't cause noticeable thinning of scalp hair because new hair is growing in at the same time that hair is shedding. However, hair loss occurs when this hair growth cycle and shedding is disrupted or when the hair follicle becomes destroyed and replaced with scar tissue. Female pattern hair loss (androgenetic alopecia) is the most common form of hair loss in women. This occurs gradually and is caused by genetics (from either side of the family), age, and the action of a specific male hormone, dihydrotestosterone (DHT). This hormone is found in lesser amounts in women and it preys on the hair follicles, preventing them from receiving vital nutrients for proper hair follicle growth, leading to the hairs shrinking, and resulting in a shorter lifespan. Interestingly, DHT does not need to be elevated to generate hair loss. Estrogen, when lowered as commonly seen in menopause, creates a change in the ratio of male to female hormones, giving an edge to these male hormones. Compounded with the sensitivity of DHT to the hair follicles, heredity can affect the age at which a woman begins to lose her hair, as well as the rate of hair loss and the extent of baldness. 
Changing the shape, thickness and length of the eyebrow is a commonly practiced beauty technique. Some people even remove the eyebrow entirely only to replace it with a pencil-drawn mark (eyebrow pencil). As with any part of the body, repeated irritation can eventually lead to hair loss. Sometimes this is due to manual trauma, chemicals from cosmetics or even infections that arise when breaks in the skin occur. While eyebrow modification will not stop as a commonly practised beauty technique, it should at least be minimized.

It is perfectly normal for people to shed 50 to 100 hairs per day. This generally doesn't cause noticeable thinning of scalp hair because new hair is growing in at the same time that hair is shedding. However, hair loss occurs when this hair growth cycle and shedding is disrupted or when the hair follicle becomes destroyed and replaced with scar tissue. Female pattern hair loss (androgenetic alopecia) is the most common form of hair loss in women. This occurs gradually and is caused by genetics (from either side of the family), age, and the action of a specific male hormone, dihydrotestosterone (DHT). This hormone is found in lesser amounts in women and it preys on the hair follicles, preventing them from receiving vital nutrients for proper hair follicle growth, leading to the hairs shrinking, and resulting in a shorter lifespan. Interestingly, DHT does not need to be elevated to generate hair loss. Estrogen, when lowered as commonly seen in menopause, creates a change in the ratio of male to female hormones, giving an edge to these male hormones. Compounded with the sensitivity of DHT to the hair follicles, heredity can affect the age at which a woman begins to lose her hair, as well as the rate of hair loss and the extent of baldness. 


In order to prevent drying and breakage, it’s best to stay away from heat tools, such as hair dryers and straightening irons. Extensions and other styling methods can also weaken your hair and cause early hair loss. If you must dye your hair, choose an all-natural hair color. Artificial chemicals found in dyes and perms can compromise your scalp and hair health. When you wash your hair, always use a nourishing conditioner to keep your scalp healthy and promote healthy hair growth.
When men have hereditary hair loss, they often get a receding hairline. Many men see bald patches, especially on the top of the head. Women, on the other hand, tend to keep their hairline. They see noticeably thinning hair. The first sign of hair loss for many women is a widening part. In rare cases, men see noticeably thinning hair. And in rare cases, women can see a receding hairline or bald patches. The reasons for this are unknown.
“When I went in for my Bosley consultation, my senior counselor was the one who walked me through the procedure. He also had had the procedure done, and his results were phenomenal. And I was thinking, ‘Wow, if I can get that, that’s what I’m looking for.’ He really got it — he understood me. He understood what I went through, and that was really important to me.
Scurf refers to the scales and greasy crusts that accumulate along the hair shaft and indicates the presence of seborrhea.[26,27] Collarettes are composed of hard fibrinous scales[25,28] surrounding each individual eyelash. They travel upward along with the growth of the lashes and are indicative of staphylococcal infection. Sleeves or cylindrical dandruff comprise scales that form a cuff around the lash root and are connected with it, in contrast to greasy scales which are not connected to the lash root.[29] Sleeves indicate infestation with Demodex folliculorum.
Thank goodness! I am a teacher which requires me to get up about 5:30 during the school year. This summer, I will turn 62 and although I’ve always had problems waking up early in the morning – he it is so severe that I am sleeping 12 to 14 hours a day! This is terrifying as school starts in less than two weeks. I am postmenopausal for close to 20 years now and recently found out that my estrogen level is elevated. Your article is a godsend; I will now be able to have an intelligent discussion with my gynecologist and hopefully become a morning person for the first time in my adult life!
Your body has an amazing capacity to send out signals when it’s in trouble, and your eyebrows are no exception. Aging causes harmless thinning of the hair, in general, so it may contribute to less-than-lush eyebrows. But when the thinning is accompanied by other symptoms, a visit to your doctor or dermatologist is in immediate order. With timely treatment, your brows—and, more important, your body—can make a steady and healthful recovery.
Taking estrogen supplements as part of a hormone replacement therapy regime has its effects on your hair as well. Women can treat a type of hair loss called androgenic alopecia, associated with low estrogen and progesterone, by replacing these hormones artificially. Dosages of synthetic estrogen should be monitored regularly -- abnormal hair growth is a possible side effect of one kind of hormone replacement therapy, called esterified estrogens.
Management of madarosis primarily depends upon treatment of the predisposing disorder. Inherited disorders can be identified by the associated clinical features. Establishing the diagnosis is an important prerequisite for the management of madarosis. For this, madarosis can be broadly classified as scarring and non-scarring. In non-scarring madarosis, generally regrowth of hair occurs after treatment of the primary disorder. In disorders such as lepromatous leprosy, though the madarosis is non-scarring, hair regrowth does not occur. In such cases, and in cases of scarring madarosis, hair transplant is essential for cosmetic purposes.
This is an autoimmune disorder that is also known as “spot baldness” and can result in hair loss ranging from just one location (alopecia areata monolocularis) to the entire scalp (alopecia totalis), or to every hair on the entire body (Alopecia areata universalis). Although it is thought to be caused by hair follicles becoming dormant, what triggers alopecia areata is not exactly known. In most cases, the condition corrects itself.
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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.

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.
Hypoproteinemia[71] causes loss of hair due to premature onset of telogen. Loss of eyebrow hair has been reported due to chronic zinc deficiency in a patient receiving only parenteral nutrition for 2 months.[26] Acrodermatitis enteropathica is an inherited disorder of zinc deficiency which shows loss of eyebrows and lashes in addition to cutaneous manifestations.[72,73] Biotin deficiency can result in encephalopathy, neurological disorders, skin desquamation, and loss of eyebrows and eyelashes.[74] Iron deficiency may be a possible cause for diffuse telogen hair loss; its exact role however is subject to speculation.[75]
When you see more hair in the shower drain, in your hair brush or your ponytail holder goes around an extra time all of a sudden this is typically low thyroid, high stress or low estrogen. It can also be the increased inflammation or oxidative stress or as a result of nutrient deficiencies especially anemias (low iron, B12, etc.). Let’s dig into each of these.
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:

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]
Skin infections can cause hair loss at the affected area. One of the more common causes is a fungal infection of the skin, also sometimes referred to as a ringworm. Eyebrow fungus is more likely to be related to a scalp fungus (tinea capitis) and both areas are often affected at the same time. A bacterial infection is another possible cause. Folliculitis for example is a condition where the hair follicle becomes infected usually with bacteria like Staphylococcus aureus. Eventually this can lead to loss of the hair in the infected follicle.
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. 

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.
Optimal levels of estrogen help to grow full thick hair, while low estrogen levels lead to thin and stalled hair growth, which eventually leads to hair loss. Through the years, a women will go through various cycles of highs and lows in estrogen levels. Puberty is typically associated with high estrogen levels as a woman starts to cycle through menstruation. Pregnancy typically increases hormone production, but once the baby has been delivered the mother can experience a drop in estrogen levels, which can result in thinning and loss of hair. Typically, this corrects itself as the woman's body heals and hormonal regulation returns to normal.  The largest decline in estrogen levels is during menopause. Estrogen is secreted through the ovaries and adrenal glands. When a woman hits menopause, the ovaries’ estrogen production is significantly diminished, which puts an excess burden on the adrenals to produce it. However, as the adrenals are typically overburdened due to stress, symptoms of menopauses like hair loss and hot flashes occur prematurely and excessively for some. Nourishing the body and balancing stress levels will support gentle and graceful transitions.  
In this section, our Houston Hair Transplant Team discusses current trends in hair loss and restoration research with published experts. We choose our interviewees based on those who have had NIH or Medline indexed published medical research that is peer-reviewed. The list will be organized by country and then alphabetically by physician last name. Click on the name to read about the latest research in thinning hair and hair restoration from around world. We thank our specialists below for giving us the valuable time and sharing of insight. We are deeply grateful and honored to have had the privilege to get the insight provided by these world renown specialists
Hair loss on the eyebrows can be partial where the hair falls off in patches or the eyebrow thins and shortens abnormally. It may occur on one side or both sides. It can also be complete where all the hair on one or both eyebrows are lost. These patterns of eyebrow hair loss can give some indication of the underlying cause even when there are no other symptoms. Some of these conditions may be specific to the eyebrows (the hair follicles and skin in that region) or can be an extension of problems affecting surrounding skin like the face, forehead or scalp.
Dutasteride is a 5-alpha-reductase inhibitor that binds both types I and II enzymes. Compared with finasteride, its inhibition of type II enzymes is three times more potent; its inhibition of type I enzymes is 100 times more potent (Clark et al., 2004). Dutasteride is not approved for the treatment of FPHL by the FDA, and ongoing studies on the efficacy of the inhibitor are promising but largely focus on male patients (Gupta and Charrette, 2014, Olsen et al., 2006). A study of women after 3 years of therapy showed that dutasteride may be more effective than finasteride in women under 50 years of age as measured by hair thickness (not hair density) at the center and vertex scalp (Boersma et al., 2014). One case report of a 46-year-old female with FPHL showed some response after 6 months of treatment with a dose of 0.5-mg dutasteride daily despite a minimal response to treatment with finasteride and minoxidil (Olszewska and Rudnicka, 2005). Data with regard to the treatment side effects in women is extremely limited. Dutasteride is classified as pregnancy category X because of teratogenicity and should have the same theoretical risk of breast cancer as mentioned in relation to finasteride (Kelly et al., 2016).
Hair loss can occur either in acute or chronic hypervitaminosis A. Loss of eyebrows and eyelashes can occur in chronic hypervitaminosis A which can occur in a number of conditions, either due to enthusiastic overdosing or due to intentional prescription of high doses for diseases such as acne, retinal disorders with night blindness, and others.[116] The cutaneous manifestations include dry, rough, and scaly skin. Chronic hypervitaminosis A is also becoming increasingly common with use of retinoids for various skin disorders. Acitretin has been noted to cause a high incidence of diffuse hair loss.[117] Premature teloptosis may be a prime factor in hair loss induced by retinoids.[98]
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]
Giorgos Tsetis: There are really two industries at work here that have to be separated. First, there's the drugs, the pharma, which is the FDA world. Then, you have the naturals, the formulas, and the actual supplements industry. The supplement industry is really not properly regulated in this country. More surprisingly, starting a supplement company is very easy. That's why you see all of these supplements popping up, and the FDA doesn't even have the capacity to monitor them all and make sure people are able to substantiate proper claims. As a supplement manufacturer, all you have to do is create your products in a FDA approved facility, and there thousands of them in the United States. That means anyone can put a formula together and get away with claims until they get challenged by consumers or competitors. When you step into these factories, you see it's messy. You're not talking about state-of-the-art factories where people are doing the work. It's really scary.
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.
The real culprit appears to be dihydrotestosterone (DHT), a more potent form of testosterone. DHT is made from testosterone by a specific enzyme in the body, and while both testosterone and DHT are known to have a weakening effect on hair follicles, there appears to be something unique about the conversion process of testosterone to DHT that relates to thinning hair. This is why some drugs that are marketed for hair loss block the conversion of testosterone to DHT. (It’s important to note, however, that these drugs tend to be less effective in women than men, and that one of them—finasteride—is only approved for hormonal hair loss in men, not women. What’s more, the drug has been associated with increased risk of sexual side effects, depression, nausea, hot flashes, and increased estrogen levels—and too much estrogen is its own risk factor for thinning hair; more on that below.)
Dutasteride is a 5-alpha-reductase inhibitor that binds both types I and II enzymes. Compared with finasteride, its inhibition of type II enzymes is three times more potent; its inhibition of type I enzymes is 100 times more potent (Clark et al., 2004). Dutasteride is not approved for the treatment of FPHL by the FDA, and ongoing studies on the efficacy of the inhibitor are promising but largely focus on male patients (Gupta and Charrette, 2014, Olsen et al., 2006). A study of women after 3 years of therapy showed that dutasteride may be more effective than finasteride in women under 50 years of age as measured by hair thickness (not hair density) at the center and vertex scalp (Boersma et al., 2014). One case report of a 46-year-old female with FPHL showed some response after 6 months of treatment with a dose of 0.5-mg dutasteride daily despite a minimal response to treatment with finasteride and minoxidil (Olszewska and Rudnicka, 2005). Data with regard to the treatment side effects in women is extremely limited. Dutasteride is classified as pregnancy category X because of teratogenicity and should have the same theoretical risk of breast cancer as mentioned in relation to finasteride (Kelly et al., 2016).
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. 

Around 30 million U.S. women will experience hereditary hair loss, or female pattern baldness (androgenetic alopecia), while others will struggle with situational hair loss, brought on by medical conditions, medications, poor health and nutrition, environmental factors such as smoking and sun damage, or even from adverse reactions to hair care products or treatments.
Yeah right! The way Policing works in this country now if you stopped someone giving a cop a good hiding the same cop would then nick you for assaulting his attacker. NO CHANCE! The police got themselves into this by not doing their jobs properly and PROTECTING innocent people. Now? What trust and support there ever was for them is almost gone.....by their own hand.
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.

Furthermore, Penn dermatopathologists developed an even more advanced method called the HoVert technique for diagnosing hair loss and other disorders from a scalp biopsy. The technique uses a unique horizontal and vertical testing approach that provides a greater amount of information to the referring dermatologist than standard industry longitudinal scalp biopsies.
Hair loss may also occur due to dieting. Franchised diet programs which are designed or administered under the direction of a physician with prescribed meals, dietary supplements and vitamin ingestion have become popular. Sometimes the client is told that vitamins are a necessary part of the program to prevent hair loss associated with dieting. From a dermatologists’s standpoint, however, the vitamins cannot prevent hair loss associated with rapid, significant weight loss. Furthermore, many of these supplements are high in vitamin A which can magnify the hair loss.
According to the new study, British scientists say they found over 200 genetic markers linked to hair loss. More specifically, the study focuses on male pattern baldness. This type of baldness, also known as male alopecia, is the most common form of hair loss in men. Researchers believe this affects as many as 30 to 50% of men by the time they reach the age of 50.
Following your consultation at Sussex Trichology, Shuna Hammocks and her clinical assistant Kelly are able to sympathetically manage your concerns and guide you and your hair back to health. We are passionate about being a support to those most upset, any type of hair loss is frightening and aside from treating with your bespoke regimen at home, you may need to call, text or email on occasion to ‘check in’.

 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.


Other drugs commonly attributed to causing madarosis are miotics, anticoagulants, anti-cholesterol drugs, antithyroid drugs, propranolol, valproic acid, boric acid, and bromocriptine.[21,99] Anticoagulants in high doses have been found to produce loss of scalp, pubic, axillary, and facial hair with loss of eyebrows after a latent period of a few weeks of treatment with dextran and heparin.[100] Propranolol can cause diffuse alopecia along with loss of eyebrows due to telogen effluvium,[101] usually after three months of therapy.[44] Loss of medial aspect of eyebrows can be seen in fetuses exposed to valproic acid.[102] Diffuse alopecia including that of eyebrows has been described due to chronic ingestion of mouthwashes containing boric acid. There was complete reversal following stopping the practice.[103] Levodopa has been noted to cause severe diffuse alopecia within three months of daily use.[104] Hair loss can occur soon after starting topical minoxidil therapy (due to detachment of club hairs following resting hairs reentering anagen), and after cessation of therapy (due to telogen effluvium).[98]
It’s precisely because vitamins and minerals are SO critical to hormonal healing—and to healing the devastating side effects that come with it, like thinning hair—that I created the FLOLiving Balance Supplements. The supplement industry has very little oversight and I saw so many women waste money on supplements that at best didn’t work and at worse contained dangerous ingredients.
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.
This is an autoimmune disorder that is also known as “spot baldness” and can result in hair loss ranging from just one location (alopecia areata monolocularis) to the entire scalp (alopecia totalis), or to every hair on the entire body (Alopecia areata universalis). Although it is thought to be caused by hair follicles becoming dormant, what triggers alopecia areata is not exactly known. In most cases, the condition corrects itself.

Disclaimer: The information on Natural Fertility Info.com is provided for educational purposes only and is not intended to treat, diagnose or prevent any disease. The information on this website is not intended to replace a one-on-one relationship with a qualified health care professional and is not intended as medical advice. It is intended as a sharing of knowledge and information from the research and experience of Hethir Rodriguez and her community. We encourage you to make your own health care decisions based upon your research and in partnership with a qualified health care professional.

Hair loss in women isn't always as straightforward as it is in most men. In men, about 95 percent of all cases are caused by male pattern baldness. In women, however, hair loss can be triggered by a multitude of conditions and circumstances. During the consultation, Dr. Yaker utilizes specialized hair and scalp scanning technology to assess the distribution of hair loss, hair thickness, and how much hair is present in a particular area. It is important to note, that for women, a proper diagnosis begins with a process of elimination. More than one cause for the hair loss may coexist and need to be recognized or excluded. A comprehensive medical history, which includes a list of all medications, history of hair loss, a thorough scalp exam, a discussion of medical and skin disorders, and a complete nutritional evaluation will be needed. Blood work analysis may be required, and a scalp biopsy may also be performed if the cause of hair loss is uncertain or there is a concern for scarring alopecia.
“…a beauty editor told me she had been using Viviscal... Since beauty editors see truckloads of products every week, I was immediately convinced when she said it worked – so I bought it myself. I started taking it twice a day for the first six months and saw dramatic results within three to four months. My hair was less thinned out …and it was also less brittle. I’ve gone to the same hairdresser since I was 19, and he was the first to comment on how full and strong my hair looked…”
The hormonal process of testosterone converting to DHT, which then harms hair follicles, happens in both men and women. Under normal conditions, women have a minute fraction of the level of testosterone that men have, but even a lower level can cause DHT- triggered hair loss in women. And certainly when those levels rise, DHT is even more of a problem. Those levels can rise and still be within what doctors consider "normal" on a blood test, even though they are high enough to cause a problem. The levels may not rise at all and still be a problem if you have the kind of body chemistry that is overly sensitive to even its regular levels of chemicals, including hormones.
There is also a different in the form of 5AR enzyme (5 alpha reductase) found on the facial hair follicles vs. the scalp hair follicles. This enzyme converts testosterone into that more problematic DHT. Type I DHT is found in sebaceous glands on the face and genital area whereas Type II is found in hair follicles of the scalp. Type II DHT is typically more of a problem in men, but Type II is increased in disorders with high testosterone like PCOS.
Hair loss can occur either in acute or chronic hypervitaminosis A. Loss of eyebrows and eyelashes can occur in chronic hypervitaminosis A which can occur in a number of conditions, either due to enthusiastic overdosing or due to intentional prescription of high doses for diseases such as acne, retinal disorders with night blindness, and others.[116] The cutaneous manifestations include dry, rough, and scaly skin. Chronic hypervitaminosis A is also becoming increasingly common with use of retinoids for various skin disorders. Acitretin has been noted to cause a high incidence of diffuse hair loss.[117] Premature teloptosis may be a prime factor in hair loss induced by retinoids.[98]
Surgeries, severe illnesses and emotional stress can cause hair loss. The body simply shuts down production of hair during periods of stress since it is not necessary for survival and instead devotes its energies toward repairing vital body structures. In many cases there is a three month delay between the actual event and the onset of hair loss. Furthermore, there may be another three month delay prior to the return of noticeable hair regrowth. This then means that the total hair loss and regrowth cycle can last 6 months or possibly longer when induced by physical or emotional stress. There are some health conditions which may go undetected that can contribute to hair loss. These include anemia or low blood count and thyroid abnormalities. Both of these conditions can be detected by a simple, inexpensive blood test.
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