Why Is My Hair Falling Out?

Find out what’s causing your hair loss (and what to do about it)
A woman concerned about hair loss stares at her hairbrush.

Have you suddenly noticed gobs of hair clogging your hairbrush and shower drain? Or maybe your once-lustrous locks are looking a little sparse. It’s enough to make you want to pull your hair out — if nature wasn’t already doing that for you.

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What’s behind your tress distress? We talked to dermatologist Shilpi Khetarpal, MD, to get the scoop on why you’re losing hair (and what to do about it).

Why do I shed so much hair?

Hair shedding is totally normal. But excessive shedding — known in medical terms as telogen effluvium — is often a sign that something’s up.

But it’s a sign that can take time to reveal itself. Hair grows in a cycle. It grows, then rests and finally sheds. At any given moment, each hair on your head is at a different point of that cycle.

That cycle takes time, says Dr. Khetarpal. “So any major shedding you see today is the result of what happened three months ago.”

Several things can cause over-the-top shedding. Here are some of the common culprits.


Stress can trigger telogen effluvium. But it typically takes a major stressor, like divorce or the death of a loved one (a big work deadline or a blind date probably isn’t enough to make your strands say sayonara).

Pregnancy and hormone changes

Most women lose a lot of hair a few months after giving birth. Later in life, some women notice extra shedding during menopause. You might also notice shedding if you’re dealing with other hormonal changes, such as stopping birth control pills.

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Illness can trigger hair loss, especially if it goes hand-in-hand with a high fever. “Any major shock to the body can cause you to start shedding two or three months later,” Dr. Khetarpal says.

Thyroid problems

Both hyperthyroid disorder (an overactive thyroid gland) and hypothyroid disorder (a sluggish thyroid) can lead to excessive shedding.

Nutrient deficiencies

Hair loss can be a side effect of anemia (low iron levels). It can also be caused by shortages of other nutrients, including B vitamins and vitamin D. “Our body needs certain vitamins and nutrients to build hair,” notes Dr. Khetarpal.


Chemotherapy drugs to treat cancer are famous for causing hair loss. But many other common medications can lead to hair loss or thinning, including antibiotics, antidepressants and blood pressure medications.

Hair loss: Understanding alopecia

Excessive shedding is one problem. But true hair loss — known as alopecia — is a different animal. Alopecia causes hair loss over time, which can sometimes be permanent. There are several types of alopecia: 

Alopecia areata

This autoimmune disease develops when your body attacks your hair follicles. It can occur anywhere on the body, including the scalp. Alopecia areata often causes round, patchy areas that are completely hair-free.

Traction alopecia

Tight hairstyles cause this type of hair loss. It can show up if you wear tight braids or ponytails every day or regularly wear hair extensions or weaves. These styles tug on the hair roots, damaging the hair follicles over time.

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Androgenetic alopecia

Androgenetic alopecia is the most common type of hair loss in both men and women. In males, it’s the cause of familiar male-pattern baldness. But it also occurs in women, more often after menopause.

This hair loss tends to come on gradually. You might notice your part is getting wider or that more of your scalp is poking through your ‘do.

Hair loss treatment

Worried about hair loss? The best thing to do is mention it to your doctor.

Excessive shedding usually stops on its own, especially if it’s caused by stress or fever. But your doctor can check for underlying problems like thyroid disorders or nutrient deficiencies. Treating those problems will reverse the hair loss.

Treatments can help excessive shedding and alopecia. Some options include:

  • Topical products like minoxidil (Rogaine®).
  • Laser caps to stimulate hair growth.
  • Medications to target the hormones that can drive hair loss.
  • In-office treatments to regrow hair, such as platelet-rich plasma therapy.

“It’s important to have a discussion with your doctor to find the right treatment,” says Dr. Khetarpal. And in the case of alopecia, the sooner you start, the better. “The longer the hair is gone, the harder it is to get back,” she says.

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