5 Hair Changes Your Stylist Might Notice with an Underactive Thyroid

Have you ever wondered if the changes in your hair could be signaling something more about your overall health? Your hair stylist sees your hair regularly, often noticing subtle shifts in texture, thickness, and growth before you do. This article explores five specific hair-related signs that a professional might spot, which could be linked to an underactive thyroid.

Important Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Hair stylists are not medical professionals and cannot diagnose health conditions. If you are concerned about your thyroid or hair health, it is essential to consult with a qualified healthcare provider for proper diagnosis and treatment.

What is an Underactive Thyroid?

The thyroid is a small, butterfly-shaped gland located at the base of your neck. It produces hormones that regulate your body’s metabolism, controlling everything from your heart rate to how quickly you burn calories. When your thyroid doesn’t produce enough of these crucial hormones, it’s known as hypothyroidism, or an underactive thyroid. This slowdown can affect nearly every system in your body, and the signs often appear gradually, making them easy to overlook. Your hair, however, is often one of the first places these changes become visible.

Here are five signs of an underactive thyroid that your hair stylist might be the first to point out.

1. Unusual Hair Shedding and General Thinning

Everyone sheds hair. It’s normal to lose between 50 and 100 hairs a day. However, a stylist is in a unique position to notice when this normal shedding crosses the line into significant hair loss.

What a stylist notices: During a shampoo and conditioning treatment, a stylist might see an alarming amount of hair collecting around the drain. When they comb through your wet hair, they may find their comb is much fuller than usual. Over several appointments, they might also observe that your hair’s overall density has decreased. For example, a ponytail might feel less full, or they may see more of your scalp when parting your hair for a cut or color service. This type of hair loss, known as telogen effluvium, is often diffuse, meaning it happens all over the head rather than in specific patches.

2. A Shift Towards Dry, Brittle, and Coarse Texture

One of the most immediate changes a stylist can feel is a dramatic shift in your hair’s texture. Thyroid hormones play a role in keeping your hair follicles and oil glands working properly. When hormone levels are low, this system can be disrupted.

What a stylist notices: As soon as they touch your hair, a stylist can tell if it feels different. Hair that was once soft and manageable may suddenly feel coarse, straw-like, and brittle. It may lack its usual shine and appear dull and lifeless. They might comment that your hair feels “thirsty” or isn’t absorbing conditioning treatments the way it used to. This dryness also leads to increased breakage, and a stylist will see small, broken strands throughout your hair during styling.

3. Noticeably Slower Hair Growth

Thyroid hormones are essential for regulating the hair growth cycle. An underactive thyroid can prolong the resting (telogen) phase of the hair follicle, meaning hair stays on the head longer without growing, and new hair growth is slowed.

What a stylist notices: A regular client who comes in every six to eight weeks for a trim might find their stylist commenting that their hair has barely grown. Layers from a previous cut might still look sharp and fresh, and roots from a color service may not be as prominent as expected for the time that has passed. For someone trying to grow their hair out, this can be particularly frustrating, and their stylist will be the first to confirm that the growth rate has stalled.

4. Thinning Eyebrows and Body Hair

Hair loss from hypothyroidism isn’t just confined to the scalp. It can affect hair all over the body, but one of the most classic and specific signs is the thinning of the outer third of the eyebrows. This is sometimes referred to as the “Sign of Hertoghe” or “Queen Anne’s sign.”

What a stylist notices: Many hair stylists also provide services like eyebrow waxing or shaping. They have an up-close and personal view of your brows at every appointment. A stylist might notice that the outer edges of your eyebrows are becoming sparse or have disappeared altogether. While many people experience some eyebrow thinning with age, a sudden or pronounced loss in this specific area can be a red flag that they might gently point out.

5. Lack of Vibrancy or Changes in Hair Color

While less common than the other signs, some individuals with hypothyroidism report changes to their hair’s pigment. The overall health of the hair follicle is compromised, which can affect the cells that produce melanin, the pigment responsible for hair color.

What a stylist notices: A colorist, in particular, would be attuned to these changes. They might find that your natural hair color appears duller or less vibrant than before. Some evidence suggests a link between thyroid conditions and premature graying. Your stylist might see an increase in gray hairs that seems unusual for your age or family history. They may also notice that hair color services don’t take as well or fade faster due to the hair’s poor condition and increased porosity.

What to Do If You Notice These Signs

If your stylist mentions these changes, or if you’ve noticed them yourself, try not to panic. Many factors can affect hair health, including stress, diet, and other medical conditions. However, it is a good idea to take these observations seriously.

The next step should be to schedule an appointment with your primary care doctor or an endocrinologist. They can listen to your symptoms, perform a physical exam, and order a simple blood test to check your thyroid hormone levels. If an underactive thyroid is diagnosed, it is typically managed effectively with medication, and many people find their hair health improves significantly with treatment.

Frequently Asked Questions

Can hair loss from an underactive thyroid be reversed? Yes, in most cases. Once thyroid hormone levels are stabilized with proper medication, the hair growth cycle typically returns to normal. It can take several months to see significant regrowth because hair grows slowly, but most people experience a return to their previous hair density and texture.

Are there other common causes for these hair changes? Absolutely. Nutritional deficiencies (like low iron or vitamin D), significant stress, hormonal changes after pregnancy, certain medications, and other autoimmune conditions can all cause similar hair symptoms. This is why a proper diagnosis from a doctor is crucial.

What kind of doctor should I see for a suspected thyroid issue? Your primary care physician (PCP) is a great place to start. They can order the initial blood tests. If the results indicate a thyroid problem, they may refer you to an endocrinologist, a doctor who specializes in hormone-related conditions.