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.
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.
Toxic alopecia occurs when there is a disruption of hair growth in the anagen phase. This usually occurs following chemotherapy and radiotherapy.[94] Radiotherapy for various types of ocular tumors, eyelid and choroidal tumors have been reported to produce madarosis.[95–97] Hair loss due to radiation is usually reversible, but may be permanent when the dose of radiation is in the range of 50 to 60 Gy.[94]
Alopecia areata: Researchers believe that this is an autoimmune disease. Autoimmune means the body attacks itself. In this case, the body attacks its own hair. This causes smooth, round patches of hair loss on the scalp and other areas of the body. People with alopecia areata are often in excellent health. Most people see their hair re-grow. Dermatologists treat people with this disorder to help the hair re-grow more quickly.
During and after pregnancy, estrogen levels may frequently rise and then dip back down quickly. This sudden dip is what leads to hair loss after giving birth, which can be normal and should stop as hormone levels balance again. If hair loss is accompanied by a myriad of other symptoms post pregnancy, there may be a deeper issue beyond normal hormone fluctuations, such as thyroid function. “But exhaustion, feeling down, difficulty losing weight, intense struggle to produce enough breast milk, and hair loss aren’t always just a normal part of having had a baby,” says Dr. Aviva Romm. If you are experiencing any of these issues post pregnancy, do talk to your doctor about what you are going through.
If you’re in good health but would like your brows to be a bit fuller, you’ve got plenty of options. Massage a bit of moisturizing coconut oil into your eyebrows about three times weekly, to make for healthier, shinier and more eye-catching hair. Eyebrow pencils remain an effective choice as a go-to filler; go a shade lighter than your brows for a natural look. To shake things up a bit, opt for a brow shadow. These powders, which look like eye shadow, go on with a brush and fill in thin or patchy brows with a soft and subtle fullness.
Giorgos Tsetis: I am an entrepreneur and have an engineering background that allows me to think in strategic ways to solve complex problems. Of course, I did have this very personal experience. But, to be honest with you, getting into this category wasn't directly a choice, it felt more like destiny. I say that, because their are literally millions who suffer from what I was suffering from. Aside from being a model, I owned an engineering company in New York, and business was steadily growing. The tipping point came when I found out the University of Washington published research that said my issue could cause permanent sexual dysfunction without the specific drug I was taking. That's when I panicked, reached out to my business partner and dear friend, and we begun to dig deeper into the issue. As we started diving deep, we recognized there was a tremendous white space.
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Thallium poisoning should be suspected in any patient manifesting nervous system and gastrointestinal symptoms along with alopecia. The hair loss affects the scalp, periocular hair, limbs, and sometimes the axillae. Examination of the hair roots under a microscope using polarized light shows distorted anagen roots and several black zones in continued poisoning.[118]
Our professionally-trained people, products and services can help any person of any age or ethnicity, with any hair type or level of hair loss—whether it’s just beginning, it’s all gone or somewhere in between. We’re constantly innovating, using cutting-edge technologies and the latest proven hair restoration methods. We combine that innovation and technology with decades of first-hand experience in helping people deal with the issue of hair loss.
If you’ve overplucked your brows too many times, you may have caused trauma to the follicles in the meantime, signalling not only those hairs you plucked to stop growing back, but also the hairs in surrounding areas. The good news: If the hair follicles aren’t dead, they can possibly be shaken from their resting state with a good brow enhancer. (like WINK  yes of course, we have to say it). There’s no sure bets, but it’s worth a try–plus Wink has a money-back guarantee!

While these factors contribute to hair loss for any woman, it’s particularly dicey for those of us with PCOS because when the follicle is exposed to our elevated androgens such as DHT (di-hydro testosterone, an active metabolite of testosterone) it gets damaged. Whenever a cell is damaged it generates oxidative stress which further alters the androgen receptor in the follicle perpetuating the issue.


Hansen’s disease – Hansen’s disease, popularly known as leprosy could cause loss of eyebrows. This condition is cause by infection of a bacterial known as mycobacterium leprae and if it affects your eyebrows region, you expect to lose some eyebrows i.e. if it affects your eyebrow skin region, a place it often afflicts, you could suffer from permanent eyebrow hair loss as ‘Tulay Cakiner-Egilmez, Ph.D., R.N’ reports in ‘Journal of the American Society of Ophthalmic Registered Nurses’. This and other infections that can cause loss of eyebrows.
These important micronutrients, which are all essential for hair health, are part of my Balance Supplements. And even if you eat a healthy, phytonutrient rich diet, you might not have optimal levels of the vitamins and minerals you need to promote hair health. Environmental factors beyond our control, from the mineral-depleted soil in which most of our food is now grown to shifts in growing practices that have reduced the amount of vitamins and minerals in various foods, can leave us eating a picture-perfect diet and still deficient in certain micronutrients.

Last week, we schooled you on the foods and vitamins for long, healthy hair. Today, Kristin Dahl, a Los Angeles-based nutritionist and women’s wellness educator, is back again to talk about all things hormones and hair loss. Keep reading for Dahl's guide to maintaining optimum hormonal balance, how stress can mess with your mane, lock-block hair growth, and more. As the founder of The Women’s Wellness Collective and the holistic lifestyle hub, Dahl House Nutrition, Dahl knows what she's talking about so we'd take notes if we were you. 


The majority of women with androgenic alopecia have diffuse thinning on all areas of the scalp. Men on the other hand, rarely have diffuse thinning but instead have more distinct patterns of baldness. Some women may have a combination of two pattern types. Androgenic alopecia in women is due to the action of androgens, male hormones that are typically present in only small amounts. Androgenic alopecia can be caused by a variety of factors tied to the actions of hormones, including, ovarian cysts, the taking of high androgen index birth control pills, pregnancy, and menopause. Just like in men the hormone DHT appears to be at least partially to blame for the miniaturization of hair follicles in women suffering with female pattern baldness. Heredity plays a major factor in the disease.

Several skin conditions, including psoriasis, eczema, and seborrheic dermatitis, don't directly lead to hair loss, but cause inflammation (a symptom of these conditions) near the brow that may be to blame. The urge to scratch and rub the inflamed area can indirectly cause eyebrow hairs to fall out. Loss that occurs in this manner is usually patchy, but as it is generally non-scarring (the hair follicle is intact), eyebrows can and often do grow back.
"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!"
See a dermatologist for itchy skin or rashes around your brows. These patches may indicate a skin infection or interaction with a new beauty product or environmental trigger. You could also have inflammation from dermatitis or psoriasis.[32] These conditions don’t actually cause hair loss, but they can lead to it if you rub and scratch the affected areas.
Estrogen, the power player in women’s bodies, is your friend when it’s appropriately balanced. It makes you feel energized, helps stabilize your moods and contributes to a healthy sex drive. Yet too much estrogen, which can be caused by weight gain, perimenopause or toxicity from exposure to endocrine disruptors (which are rampant in our food, water and plastic products), can lead to thinning hair. During and after pregnancy, for example, estrogen levels peak and then dip, causing sudden hair loss for many women.
When this process is disrupted you end up with thinner hair, increased hair loss, a failure to regrow new hair and all in all a super sad experience! No one love losing their hair and it’s such a huge source of upset for women I work with but I’ll be honest, it is often the last thing to change as we work through getting your hormones and metabolism more balanced. It’s simply not your body’s priority.

For now, therapies include cortisone injections directly into the bald patches; topical cortisone; Minoxidil — known to many people under the brand name Rogaine; and anthralin cream. A less-widely available option is topical immunotherapy: certain chemicals applied to the scalp can trigger an allergic rash, which alters the immune response, NAAF notes.
Some medications have side effects that include hair loss. Talk to your doctor if you are experiencing significant hair loss and you think that your medication might be the cause. Your doctor might be able to switch you over to another type of medicine without any reported side effects. Don’t stop taking your medications until you’ve spoken with your doctor, as this could be dangerous for your health.
Hormones are cyclical. Testosterone levels in some men drop by 10% each decade after age 30. Women's hormone levels decline as menopause approaches and drop sharply during menopause and beyond. The cyclic nature of both our hair and hormones is one reason hair loss can increase in the short term even when you are having a long-term slowdown of hair loss (and a long-term increase in hair growth) while on a treatment that controls hair 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.)
The hormone imbalance known as hypothyroidism is a common cause of abnormal eyebrow thinning, especially in women; roughly 27 million Americans suffer from thyroid disease, and about 80 percent of them are women. Thinning eyebrows appear as a symptom of both hypothyroidism (underactive thyroid production) and hyperthyroidism (overactive thyroid production), alongside issues such as excessive fatigue, difficulty losing weight and constantly feeling cold. If your brows appear particularly thin around the edges, visit your doctor for a thyroid screening, which should include thorough blood work. With prescription medication, your eyebrows should fill back in over the ensuing months.
MICHAEL REED, MD: Over-the-counter minoxidil, which is the brand Rogaine, is FDA approved. It's been shown to be effective in scientific studies. Propecia is the new drug on the block, and that probably is more effective. It's a pill that you take once a day, and that has been shown to slow down hair loss and grow hair in a significant number of individuals. Most of the other preparations that are heavily advertised or marketed are not proven to be effective.
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.
The majority of women with androgenic alopecia have diffuse thinning on all areas of the scalp. Men on the other hand, rarely have diffuse thinning but instead have more distinct patterns of baldness. Some women may have a combination of two pattern types. Androgenic alopecia in women is due to the action of androgens, male hormones that are typically present in only small amounts. Androgenic alopecia can be caused by a variety of factors tied to the actions of hormones, including, ovarian cysts, the taking of high androgen index birth control pills, pregnancy, and menopause. Just like in men the hormone DHT appears to be at least partially to blame for the miniaturization of hair follicles in women suffering with female pattern baldness. Heredity plays a major factor in the disease.

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.
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.
When your body goes through something traumatic like child birth, malnutrition, a severe infection, major surgery, or extreme stress, many of the 90 percent or so of the hair in the anagen (growing) phase or catagen (resting) phase can shift all at once into the shedding (telogen) phase. About 6 weeks to three month after the stressful event is usually when the phenomenon called telogen effluvium can begin. It is possible to lose handful of hair at time when in full-blown telogen effluvium. For most who suffer with TE complete remission is probable as long as severely stressful events can be avoided. For some women however, telogen effluvium is a mysterious chronic disorder and can persist for months or even years without any true understanding of any triggering factors or stressors.

Hair loss is one of the most irritating and worrisome issues anyone would ever have to meet with. It is obvious that there are various reasons which may cause hair loss in individuals. One of the causes of hair loss can be a low level of estrogen hormone. There is a connection between estrogen and hair loss. In this current article, we will talk about if low estrogen can cause hair loss and also know of ways to prevent it. Hope this would be a beneficial read for you.


It is an impulse-controlled disorder characterized by compulsive plucking or breakage of hair.[91] The most frequent site of hair pulling is the scalp, but the eyebrows, eyelashes, and pubic hair may also be involved. Trichotillomania manifests in eyelashes and eyebrows as irregular patches of alopecia containing hairs of varying lengths. Inflammation, scarring, and atrophy are conspicuous by their absence. Patients often attempt to conceal their alopecia by cosmetological camouflage. In case of a diagnostic dilemma, histological features such as increased numbers of catagen hairs, pigment casts, and traumatized hair bulbs provide a clue.
Everyone’s hair loss is different. Which is why, at Hair Club, we don’t provide a one-size-fits-all solution to restore your hair. Instead, we consult one-on-one with you to understand what’s needed to fit your taste and lifestyle. Only then will we custom tailor a solution that works best for you, so you can get the results you want. It’s what we’ve done for 600,000+ satisfied clients. It’s what we’ll proudly do for you.
*Photograph used with permission of the Journal of the American Academy of Dermatology. This photograph was published in the Journal of the American Academy of Dermatology, Vol. # 60, Gathers RC, Jankowski M, Eide M, et al. “Hair grooming practices and central centrifugal cicatricial alopecia,” 660-8. Copyright Elsevier (2009). Journal of the American Academy of Dermatology.   
Accurate placement of the grafts is necessary to ensure a good cosmetic result. In the medial third, the needles should be inserted parallel to the brow axis.[203] The follicles should point toward the tip of the nose and the hairs should converge toward each other in the other two segments, that is, the bulbs in the upper part point toward the forehead and in the lower part toward the other eyebrow.[204]
Hair loss is one of the most irritating and worrisome issues anyone would ever have to meet with. It is obvious that there are various reasons which may cause hair loss in individuals. One of the causes of hair loss can be a low level of estrogen hormone. There is a connection between estrogen and hair loss. In this current article, we will talk about if low estrogen can cause hair loss and also know of ways to prevent it. Hope this would be a beneficial read for you.
If you’ve overplucked your brows too many times, you may have caused trauma to the follicles in the meantime, signalling not only those hairs you plucked to stop growing back, but also the hairs in surrounding areas. The good news: If the hair follicles aren’t dead, they can possibly be shaken from their resting state with a good brow enhancer. (like WINK  yes of course, we have to say it). There’s no sure bets, but it’s worth a try–plus Wink has a money-back guarantee!
No one wants to lose their hair, but for a woman it is particularly distressing. While men can look perfectly presentable — even sexy — with their exposed scalp, no such options exist for the 30 million American women who grapple with thinning tresses. Dr. Maria Colavincenzo, a dermatologist at Northwestern University Feinberg School of Medicine, has a practice that specializes in preserving those precious strands — especially in cases of androgenetic alopecia, a hereditary condition that causes hair loss, mainly on the top and crown of the scalp. Without an appointment, she answered some of our questions:

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. 

However, the effects of alopecia reach far beyond symptoms of depression and include anxiety, obsessions, dissatisfaction with one’s appearance, and low self-esteem (Al-Mutairi and Eldin, 2011, Dlova et al., 2016, Hunt and McHale, 2005, Schmidt et al., 2001). There can be significant disturbance in a patient’s social life because they may change their hair style, clothing, or avoid social meetings (Al-Mutairi and Eldin, 2011). One study reported that 40% of surveyed women described marital problems and 63% had career-related issues that they ascribed to their hair loss (Hunt and McHale, 2005). These effects seem to occur regardless of patients’ age, race, or degree of hair loss (Dlova et al., 2016, Hunt and McHale, 2005, Schmidt et al., 2001). Another study of more than 200 women found that this psychologic morbidity occurs with equal frequency in women whose hair is typically covered by a headscarf (Erol et al., 2012).
Unlike other companies, we’ve provided one-on-one guidance, professional advice and custom-tailored solutions for our clients’ hair loss needs from the beginning. This personal touch is what made Hair Club successful then. And it’s still the secret to our success today. We continue to grow every year and have expanded to nearly 120 locations across the U.S., Canada and Puerto Rico.
Androgenetic alopecia, commonly called male or female pattern baldness, was only partially understood until the last few decades. For many years, scientists thought that androgenetic alopecia was caused by the predominance of the male sex hormone, testosterone, which women also have in trace amounts under normal conditions. While testosterone is at the core of the balding process, DHT is thought to be the main culprit.
The information contained on Smart Health Advice is intended for informational and educational purposes only. Any statements made on this website have not been evaluated by the FDA and any information or products discussed are not intended to diagnose, cure, treat or prevent any disease or illness. Please consult a healthcare practitioner before making changes to your diet or taking supplements that may interfere with medications.
Giorgos Tsetis: I am an entrepreneur and have an engineering background that allows me to think in strategic ways to solve complex problems. Of course, I did have this very personal experience. But, to be honest with you, getting into this category wasn't directly a choice, it felt more like destiny. I say that, because their are literally millions who suffer from what I was suffering from. Aside from being a model, I owned an engineering company in New York, and business was steadily growing. The tipping point came when I found out the University of Washington published research that said my issue could cause permanent sexual dysfunction without the specific drug I was taking. That's when I panicked, reached out to my business partner and dear friend, and we begun to dig deeper into the issue. As we started diving deep, we recognized there was a tremendous white space.
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.
If you’ve overplucked your brows too many times, you may have caused trauma to the follicles in the meantime, signalling not only those hairs you plucked to stop growing back, but also the hairs in surrounding areas. The good news: If the hair follicles aren’t dead, they can possibly be shaken from their resting state with a good brow enhancer. (like WINK  yes of course, we have to say it). There’s no sure bets, but it’s worth a try–plus Wink has a money-back guarantee!
Telogen effluvium is a condition where a large number of hair follicles enter the resting phase known as telogen. As these hairs may fall off, it is not replaced with new hair at the same area and this leads to a bald patch on the eyebrows. A number of hormonal factors (like with hypothyroidism and pregnancy) may be responsible and it is also related to certain diseases, nutritional deficiencies, chronic medication use and even metal toxicity. It is now also known that stress can push many more hair follicles than normal into this phase.
Estrogen and combined oral contraceptive (COC) drugs with estrogen or progestogen have been reported as effective, but data are limited (Adenuga et al., 2012, Raudrant and Rabe, 2003, Scheinfeld, 2008). They are thought to function through several mechanisms. Both components of COC drugs increase the levels of sex-hormone-binding globulin (Schindler, 2013). They also send negative feedback signals that suppress the hypothalamic secretion of gonadotropin and releases the hormone and pituitary secretion of the luteinizing and follicle-stimulating hormones, which results in a decreased androgen production (Gilman et al., 1990, Varothai and Bergfeld, 2014). These actions decrease androgen secretion from the ovary and the quantity of free, biologically active androgens, which reduces their effects on the hair follicles (Schindler, 2013). Our practice when prescribing COC drugs is a combination of ethinyl estradiol 20 mcg plus drospirenone 3 mg. Drospirenone is an analogue of spironolactone. This treatment combination is approved by the FDA for the treatment of acne but not alopecia.
The WHI was a very large, very prominent long-term study which looked at the health effects of HRT. While the study did find a few benefits (women who used HRT had fewer hip or bone fractures and were less likely to develop colorectal cancer), it found a number of risks, including an increased chance of heart attack, stroke, cancer, and blood clots.
However, the effects of alopecia reach far beyond symptoms of depression and include anxiety, obsessions, dissatisfaction with one’s appearance, and low self-esteem (Al-Mutairi and Eldin, 2011, Dlova et al., 2016, Hunt and McHale, 2005, Schmidt et al., 2001). There can be significant disturbance in a patient’s social life because they may change their hair style, clothing, or avoid social meetings (Al-Mutairi and Eldin, 2011). One study reported that 40% of surveyed women described marital problems and 63% had career-related issues that they ascribed to their hair loss (Hunt and McHale, 2005). These effects seem to occur regardless of patients’ age, race, or degree of hair loss (Dlova et al., 2016, Hunt and McHale, 2005, Schmidt et al., 2001). Another study of more than 200 women found that this psychologic morbidity occurs with equal frequency in women whose hair is typically covered by a headscarf (Erol et al., 2012).

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.


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.
*Photograph used with permission of the Journal of the American Academy of Dermatology. This photograph was published in the Journal of the American Academy of Dermatology, Vol. # 60, Gathers RC, Jankowski M, Eide M, et al. “Hair grooming practices and central centrifugal cicatricial alopecia,” 660-8. Copyright Elsevier (2009). Journal of the American Academy of Dermatology.   
Another cause of eyebrow hair loss is genetic predisposition. Many patients naturally have thinner eyebrows that run in their family. This is one of the biggest reasons patients seek our services. Medical conditions such as hypothyroidism, eczema, and alopecia areata (spot baldness) can also lead to brow hair falling out. It’s important to determine the cause of your condition to find an effective treatment.
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).
I can't tell you how many women come into my office fretting about the fact that they've over-plucked. While this is certainly a possibility (plucking the eyebrows damages the hair follicle, and with repeated plucking, the follicle can get damaged to the point that it can no longer produce a hair), there are actually a number of both external and internal causes and conditions that can lead to temporary or permanent loss of eyebrows.
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.

Some medications have side effects that include hair loss. Talk to your doctor if you are experiencing significant hair loss and you think that your medication might be the cause. Your doctor might be able to switch you over to another type of medicine without any reported side effects. Don’t stop taking your medications until you’ve spoken with your doctor, as this could be dangerous for your health. 

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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