Can Thyroid Problems Cause Hair Loss?

The Thyroid-Hair Relationship

The thyroid gland produces hormones that regulate metabolism in nearly every cell of the body — including the cells that produce hair. When thyroid function is off, hair growth is often one of the first things to suffer.

Hypothyroidism and Hair Loss

An underactive thyroid (hypothyroidism) can cause hair to become dry, brittle, and thin. It may lead to diffuse shedding across the scalp and, in some cases, thinning of the outer eyebrows. Fatigue, weight gain, cold intolerance, and brain fog often accompany it.

Hyperthyroidism and Hair Loss

An overactive thyroid (hyperthyroidism) can also cause hair thinning, sometimes alongside symptoms like rapid heartbeat, anxiety, weight loss, and heat intolerance.

Why Complete Thyroid Testing Matters

A single TSH test does not always tell the full story. A complete thyroid panel may include TSH, free T4, free T3, reverse T3, and thyroid antibodies to evaluate for autoimmune conditions like Hashimoto's. This deeper evaluation can uncover issues that standard testing misses.

Addressing Thyroid-Related Hair Loss

When thyroid dysfunction is identified and appropriately managed, hair often improves over time — though it can take several months. Dr. Masghati evaluates thyroid health as part of a comprehensive hair loss assessment, alongside hormones, iron and nutrient status, and other contributors.

Get a Complete Evaluation

If you are experiencing hair loss along with other symptoms, a thorough thyroid and hormone evaluation with Dr. Salome Masghati can help identify whether your thyroid is playing a role.