Brittle Hair and Thyroid Health

Thyroid hormones influence many body processes, including the hair growth cycle. When thyroid function is too low or too high, hair may become dry, coarse, fine, or more prone to shedding. Other clues can include changes in energy, weight, heart rate, temperature tolerance, sleep, bowel habits, or menstrual pattern. These features overlap with many other conditions, and cosmetic damage from heat or chemicals can occur at the same time.

Make a primary-care or dermatology appointment if the change is new, persistent, or accompanied by other body symptoms. Take a list of medicines, supplements, recent illness, dieting, and hair treatments. A clinician may examine the scalp and request thyroid blood tests, with additional testing guided by the history. Use conditioner, reduce heat and tension, and avoid starting thyroid medicine or large supplement doses without a diagnosis. Hair Supplement Therapy is best considered only after a clinician reviews whether it fits your needs.

Seek prompt medical advice for rapid or patchy loss, scalp pain or inflammation, or hair loss with severe weakness, fainting, chest discomfort, or a racing heartbeat. These symptoms may need assessment for reasons beyond hair fragility. If you already have thyroid disease, report a new hair change at your usual review so treatment and test results can be considered together.

Do my symptoms justify thyroid testing? Could another condition or hair treatment explain the texture? Which medicines and supplements should I list or pause? When should my hair changes be reassessed?