Hair loss associated with thyroid conditions exhibits several characteristic symptoms, including:
Diffuse Hair Loss or Thinning: Individuals may notice generalized hair thinning across the entire scalp. The hair may appear sparse and lack volume.
Patchy Hair Loss: In some cases, hair loss may occur in specific areas of the scalp, leading to smooth and circular bald patches. This pattern of hair loss is often associated with an autoimmune condition called alopecia areata, which can coexist with thyroid disease.2
Loss of Body Hair: Thyroid-related hair loss may extend beyond the scalp, causing the loss of body hair from regions such as the eyebrows. A unique symptom of hypothyroidism is the loss of hair on the outer edges of the eyebrows.
Changes in Hair Texture: Thyroid dysfunction can alter the texture of the hair.3 In hypothyroidism, the hair may become dry, coarse, and more prone to tangles. In contrast, hyperthyroidism can lead to excessively soft, fine, and fragile hair.
