11 Endocrine Disorder Symptoms You Should Not Ignore

3. Dry skin, brittle hair, and thinning nails

Slow, steady changes in skin, hair, and nails are more than cosmetic—these signs can point to endocrine dysfunction. A dry, rough skin texture, hair that falls out in larger amounts, and brittle nails that split easily are common with low thyroid function. In women, hormonal imbalances such as polycystic ovary syndrome or androgen excess can also cause hair thinning on the scalp while increasing facial hair in different areas. These changes usually develop gradually, so people often normalize them until they reach a tipping point. When checking at home, notice the pattern: is hair falling out all over, or in patches? Is the skin uniformly dry, or are there oily, acne-prone areas? A clinician will combine your exam with lab tests such as thyroid panel, ferritin for iron stores, and sometimes reproductive hormone assays. Small interventions—adjusting thyroid medication, correcting iron deficiency, or managing androgen levels—can significantly improve hair and skin over months. Because improvements come slowly, early testing helps set realistic expectations and avoids unnecessary treatments or cosmetic fixes that miss the root cause.