17 Reasons Why You're Losing Your Hair

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Why is my hair falling out?

It's not uncommon for both men and women to experience hair loss or thinning of the hair as they age. By age 60, most women will have experienced some hair loss, according to the American Academy of Dermatology; others can experience it earlier, in their 40s and 50s. Although experts aren't sure why this happens, some recommend wearing scarves, wigs and styling your hair so as to cover up thin spots.

But aging isn't the only cause of hair loss. Reasons can range from the simple and temporary — like a vitamin deficiency — to the more complex, like an underlying health condition.

In many cases, there are ways to treat both male and female hair loss. It all depends on the cause. If you're concerned about your hair loss, or you think there could be an underlying medical reason behind the issue, talk to your doctor. Here are some common and not-so-common reasons why you might be seeing less hair on your head.

Physical stress

Any kind of physical trauma—surgery, a car accident, or a severe illness, even the flu — can cause temporary hair loss. This can trigger a type of hair loss called telogen effluvium. Hair has a programmed life cycle: a growth phase, rest phase and shedding phase. "When you have a really stressful event, it can shock the hair cycle, (pushing) more hair into the shedding phase," explains Marc Glashofer, MD, a dermatologist in West Orange, New Jersey. Hair loss often becomes noticeable three-to-six months after the trauma.

What to do: The good news is that hair will start growing back as your body recovers.

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Too much vitamin A

Overdoing vitamin A-containing supplements or medications can trigger hair loss, according to the American Academy of Dermatology. The recommended dietary allowance for vitamin A is 900 mcg RAE (micrograms of retinol activity equivalents) per day for men and 700 mcg RAE for women.

What to do: This is a reversible cause of hair loss and once the excess vitamin A is halted, hair should grow normally.

Lack of protein

If you don't get enough protein in your diet, your body may ration protein by shutting down hair growth, according to the American Academy of Dermatology. This can happen about two to three months after a drop in protein intake, they say.

What to do: There are many great sources of protein, including fish, meat, and eggs, or nuts, seeds, and beans.

Male pattern baldness

For men, the most common cause of hair loss is due to male pattern baldness. This type of hair loss, caused by a combo of genes and male sex hormones, usually follows a classic pattern in which the hair recedes at the temples, leaving an M-shaped hairline.

What to do: There are topical creams like minoxidil (Rogaine) and oral medications such as finasteride (Propecia) that can halt hair loss or even cause some to grow; surgery to transplant or graft hair is also an option.

Heredity

Female-pattern hair loss, called androgenic or androgenetic alopecia, is basically the female version of male pattern baldness. "If you come from a family where women started to have hair loss at a certain age, then you might be more prone to it," says Dr. Glashofer. Unlike men, women don't tend to have a receding hairline, instead their part may widen and they may have noticeable thinning of hair.

What to do: Like men, women may benefit from minoxidil (Rogaine) to help grow hair, or at least, maintain the hair you have, Dr. Glashofer says. Rogaine is available over-the-counter and is approved for women with this type of hair loss.

Emotional stress

Emotional stress is less likely to cause hair loss than physical stress, but it can happen, for instance, in the case of divorce, after the death of a loved one, or while caring for an aging parent. More often, though, emotional stress won't actually precipitate the hair loss. It will exacerbate a problem that's already there, says Dr. Glashofer.

What to do: As with hair loss due to physical stress, this shedding will eventually abate. While it's not known if reducing stress can help your hair, it can't hurt either. Take steps to combat stress and anxiety, like getting more exercise, trying talk therapy, or getting more support if you need it.

Anemia

Women, vegans, and people with gastrointestinal diseases like Crohn's or colitis are among the people with the highest risk for anemia due to an iron deficiency (the most common type of anemia), which is an easily fixable cause of hair loss. You doctor will have to do a blood test to determine for sure if you have this type of anemia.

What to do: Talk to your doctor to see whether you should take an iron supplement, modify your diet, or take medication. In addition to hair loss, other symptoms of anemia include fatigue, headache, dizziness, pale skin, and cold hands and feet.

Hypothyroidism

Hypothyroidism is the medical term for having an underactive thyroid gland. This little gland located in your neck produces hormones that are critical to metabolism as well as growth and development and, when it's not pumping out enough hormones, can contribute to hair loss. Your doctor can do tests to determine the real cause.

What to do: Synthetic thyroid medication should take care of the problem. Once your thyroid levels return to normal, so should your hair.

Biotin deficiency

Although relatively uncommon in the U.S., low levels of this B vitamin are another correctible cause of hair loss.

What to do: Like anemia, simple supplementation should help the problem. So can dietary changes. Find biotin in fish, meat, seeds, and nuts. As always, eating a balanced diet plentiful in fruits and vegetables as well as lean protein and "good" fats such as avocado will be good for your hair and your overall health.

Autoimmune-related hair loss

This is also called alopecia areata and basically is a result of an overactive immune system. "The body gets confused," says Dr. Glashofer. "The immune system sees the hair as foreign and targets it by mistake."

What to do: Steroid injections are the first line of treatment for alopecia areata, which appears as hair loss in round patches on the head. Other drugs, including Rogaine, may also be used. The course of the condition can be unpredictable, with hair growing back then falling out again.

Dramatic weight loss

Sudden weight loss is a form of physical trauma that can result in thinning hair. This could happen even if the weight loss is ultimately good for you. It's possible that the weight loss itself is stressing your body or that not eating right can result in vitamin or mineral deficiencies. Loss of hair along with noticeable weight loss may also be a sign of an eating disorder such as anorexia or bulimia.

What to do: "Sudden weight loss seems to shock the system and you'll have a six-month period of hair loss and then it corrects itself," says Mark Hammonds, MD, a dermatologist with King Dermatology in Mountain Home, Arkansas.

Chemotherapy

Some of the drugs used to beat back cancer unfortunately can also cause your hair to fall out. "Chemotherapy is like a nuclear bomb," says Dr. Glashofer. "It destroys rapidly dividing cells. That means cancer cells, but also rapidly dividing cells like hair."

What to do: Once chemotherapy is stopped, your hair will grow back — although often it can come back with a different texture (perhaps curly when before it was straight) or a different color. Researchers are working on more targeted drugs to treat cancer, ones that would bypass this and other side effects.

Polycystic ovary syndrome

Polycystic ovary syndrome (PCOS) is another imbalance in male and female sex hormones. An excess of androgens can lead to ovarian cysts, weight gain, a higher risk of diabetes, and hair thinning. Because male hormones are overrepresented in PCOS, women may also experience more hair on the face and body.

What to do: Treating PCOS can correct the hormone imbalance and help reverse some of these changes. Treatments include diet and exercise, as well as specific treatment to address infertility or diabetes risk.

Medications, including antidepressants, blood thinners, and more

Certain classes of medication may also promote hair loss. More common among them are certain blood thinners and the blood-pressure drugs known as beta-blockers. Other drugs that might cause hair loss include methotrexate (used to treat rheumatic conditions and some skin conditions), lithium (for bipolar disorder), nonsteroidal anti-inflammatory drugs (NSAIDs) including ibuprofen, and possibly antidepressants.

What to do: If your doctor determines that one or more of your medications is causing hair loss, talk with him or her about either lowering the dose or switching to another medicine.

Overstyling

Vigorous styling and frequent hair treatments over the years can cause your hair to fall out. Examples include tight braids, hair weaves or corn rows as well as chemical relaxers to straighten your hair, hot-oil treatments or any kind of harsh chemical or high heat. Because these practices can actually affect the hair root, your hair might not grow back.

What to do: In addition to avoiding these styles and treatments, the American Academy of Dermatology recommends using conditioner after every shampoo, letting your hair air dry, limiting the amount of time the curling iron comes in contact with your hair and using heat-driven products no more than once a week.

Trichotillomania

Trichotillomania, classified as an "impulse control disorder," causes people to compulsively pull their hair out. "It's sort of like a tic, the person is constantly playing and pulling their hair," Dr. Glashofer says. Unfortunately, this constant playing and pulling can actually strip your head of its natural protection: hair. Trichotillomania often begins before the age of 17 and is four times as common in women as in men.

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