Hypothyroidism and vertical nail ridges

Vertical ridges run from the base of the nail towards its tip. They may reflect normal nail texture, dryness, repeated wetting and drying, minor trauma, or ageing. An underactive thyroid can be associated with dry skin and changes in nail growth, yet the ridge alone is not a reliable thyroid sign. Iron deficiency, skin conditions, nutritional problems, or medicines may also affect nails.

A clinician will look at all nails, the surrounding skin, your general symptoms, diet, medicines, and the speed of change. Thyroid or blood tests are considered when the wider pattern supports them.

Moisturise hands and nails regularly, wear gloves for prolonged contact with water or cleaning products, and avoid cutting or pushing back the cuticles. Keep nails at a comfortable length and do not use supplements marketed for nail growth unless a clinician has identified a need. Arrange a review if changes are new, spreading, painful, or accompanied by fatigue, cold intolerance, constipation, or weakness.

Seek prompt assessment for a dark streak that changes, a nail lifting from its bed, marked pain, swelling, pus, or a rapidly changing nail. Contact a clinician if ridges occur with unexplained weight change, palpitations, or significant tiredness. These features may point to a local nail problem or a broader condition needing examination.

Do these ridges look like normal variation or a nail disorder? Could dryness, iron levels, medicines, or thyroid function be involved? Do I need blood tests? What colour or shape changes should make me return sooner?