January 10, 2024

Is My Thyroid to Blame for My Hair Loss?

The endocrine gland in charge of hormone production may be causing your hair to shed or stop growing

close up of female pulling hairs from a brush

While taking a shower, you look down and notice more clumps of hair than usual circling the drain. In fact, you swear you might be losing hair from your armpits as well. You’ve Googled endlessly about the possible causes, but none of them seem to make sense as to why you might be losing hair.

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In truth, rapid hair loss and thinning can happen for a number of reasons, including medications, medical conditions or simply the passing of time. But another possible cause could be your thyroid. Whether you know you have a thyroid condition or not, it may be worth looking into the connection between your hair’s health and your thyroid.

Endocrinologist Mary Vouyiouklis Kellis, MD, dives into how to know if your hair loss is linked to your thyroid — and what you can do about it.

Can thyroid problems cause hair loss?

In short — yes, they can. In fact, thyroid dysfunction can cause you to not only shed hair, but also to stop growing hair altogether. Fortunately, this usually isn’t permanent. But it can be a common symptom of your thyroid’s hormone production not working correctly.

Unlike other types of baldness, thyroid-related hair loss affects not just your scalp, but also your eyebrows, pubic hair and hair on other parts of your body. It can also be caused by certain autoimmune diseases that often go hand in hand with thyroid conditions (more on that in a moment).

“The hair loss is typically reversed after your thyroid hormone levels are normalized,” explains Dr. Vouyiouklis Kellis. “But this may take some time.”

The relationship between your thyroid and your hair

If you’re not familiar with what (or where) your thyroid is — or how it relates to your hair — let’s review a few basics first.

Your thyroid is an endocrine gland located in the front of your neck and serves an important role in your body. It’s in charge of producing and releasing the endocrine hormone into your bloodstream.

Thyroid diseases occur when this hormone production is disrupted. And this can cause your hair to stop growing or even fall out.

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This hair loss can happen due to your thyroid making either too many hormones (hyperthyroidism, or an overactive thyroid) or not making enough (hypothyroidism, or an underactive thyroid).

Both underactive and overactive thyroid conditions can cause hair to stop growing, as well as hair loss. In particular, autoimmune thyroid conditions can cause thyroid-related hair loss. Some of these conditions include:

In some cases, you may also be more likely to develop alopecia areata due to a thyroid autoimmune condition. This condition can cause patchy hair loss on the scalp or other areas of your body.

How do you know if hair loss is from your thyroid?

Of course, every day, we lose up to 100 strands of hair from our heads — usually when showering or brushing our hair. But hair loss caused by thyroid conditions has more specific symptoms, including:

  • Diffuse hair thinning. The hair loss often occurs as a diffuse thinning rather than specific bald patches. You may notice a decrease in hair density and volume all over your scalp.
  • Increased shedding. People with thyroid issues may experience excessive hair shedding during washing, brushing or styling. This is known as telogen effluvium, a condition when a higher percentage of hairs enter the resting phase (telogen) and eventually fall out.
  • Hair loss on other body parts. In addition to scalp hair loss, individuals with thyroid disorders may experience hair thinning or loss on other body parts, including eyebrows, eyelashes, pubic hair and armpit hair.
  • Hair texture changing. Thyroid-related hair loss can also lead to changes in the texture of your hair. Notice if your strands feel more dry, coarse and prone to breakage.

Treatment options for thyroid-related hair loss

Depending on your symptoms and the exact thyroid condition you’re experiencing, your treatment options may vary. It’s important to see a healthcare provider to discuss in detail your symptoms so they can develop the best treatment plan.

Medications

If your healthcare provider links thyroid issues with your hair loss, they’ll likely prescribe some treatments to help minimize or reverse hair loss. Your healthcare provider may recommend going on certain medications that can help balance your thyroid’s hormone production, including:

  • Levothyroxine.
  • Propylthiouracil.
  • Methimazole.
  • Beta-blockers.

Lifestyle changes

With any kind of extreme hair loss, there are things you can work into your everyday hair routine that can help. The best tactic is to be gentle with your hair. If you’re dealing with hair loss for any reason, it’s important to be aware of the sensitivity of your hair follicles.

Try to avoid:

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  • Pulling hair back into tight ponytails, buns or braids. Instead, try wearing looser hairstyles.
  • Twisting or pulling your hair. Instead, be gentle when drying, combing or styling your hair and try not to cause too much tension.
  • Using harsher brushes when loosening knots in your hair. Instead, use a wide-toothed comb that gives your follicles more breathing room.

Consider taking biotin

The vitamin biotin has been recommended by healthcare professionals to boost your keratin (the protein that helps with the formation of hair, skin and nails). While more research is needed on the effects of biotin on hair growth, some studies have suggested a link between the supplement and improved hair thickness.

But you should always talk to your healthcare provider before starting any new supplements — they’ll know what is the right amount for you to take for your hair loss. You can also try working in more biotin-rich foods like almonds, broccoli and eggs as a fail-safe way to introduce more biotin into your system.

Dr. Vouyiouklis Kellis also stresses the importance of remembering how biotin can affect lab results. "Remember to not take biotin for at least 72 hours before labs, as it can potentially cause false lab results," she explains.

Can hair loss be caused by something else?

It’s important to note that your hair loss may be caused by something other than your thyroid. Other possible causes for hair loss include:

  • Thyroid medications. Yes, you may be dealing with a chicken or the egg situation here. What caused the hair loss first? The thyroid dysfunction or the thyroid medication? If you think this may be the case, talk to your healthcare provider about which medications you’re currently on.
  • Celiac disease. This condition can be associated with iron deficiency, which triggers hair loss.
  • Lupus. Among other symptoms like rashes and joint pain, this autoimmune disease can also cause hair loss that can range from hair thinning to clumps of hair falling out.
  • Menopause. If you’re going through menopause, you may be experiencing a low estrogen state that can thin the hair follicles, giving the appearance of overall hair loss.

The bottom line

Losing your hair can be distressing, there’s no doubt about that. But knowing the cause can help you learn how best to treat and manage this symptom. If a thyroid issue is behind your hair loss, there are steps you can take. If you’re noticing that you’re starting to shed more hair than usual, be sure to speak with a provider.

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