21 Reasons Why You're Losing Your Hair

Reasons can range from the simple and temporary to the more complex.

ByABC News
August 28, 2013, 3:33 PM
A lack of protein in one's diet can cause temporary hair loss.
A lack of protein in one's diet can cause temporary hair loss.
Getty Images

Aug. 29, 2013— -- intro: It's true that men are more likely to lose their hair than women, mostly due to male pattern baldness (more on that later).

But thinning hair and hair loss are also common in women, and no less demoralizing. Reasons can range from the simple and temporary—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. Here are some common and not-so-common reasons why you might be seeing less hair on your head.

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quicklist: 1category: Reasons for Hair Losstitle: Physical stressurl: text: 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 New York City.

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.

quicklist: 2category: Reasons for Hair Losstitle: Pregnancyurl: text: Pregnancy is one example of the type of physical stress that can cause hair loss (that and hormones). Pregnancy-related hair loss is seen more commonly after your baby has been delivered rather than actually during pregnancy.

"Giving birth is pretty traumatic," says Dr. Glashofer.

What to Do

If you do experience hair loss, rest assured that your hair will grow back in a couple of months. "It's a normal thing and it will work its way out," Dr. Glashofer says.

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quicklist: 3category: Reasons for Hair Losstitle: Too much vitamin Aurl: text: Overdoing vitamin A-containing supplements or medications can trigger hair loss, according to the American Academy of Dermatology.

The Daily Value for vitamin A is 5,000 International Units (IU) per day for adults and kids over age 4; supplements can contain 2,500 to 10,000 IU.

What to Do

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

quicklist: 4category: Reasons for Hair Losstitle: Lack of proteinurl: text: 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. If you don't eat meat or animal products, here are the 14 Best Vegan and Vegetarian Protein Sources.

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quicklist: 5category: Reasons for Hair Losstitle: Male pattern baldnessurl: text: About two out of three men experience hair loss by age 60, and most of the time it's 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.