Vitamin D deficiency and nail ridges: what to know

Vertical ridges can be a normal nail pattern and may become more noticeable with age or dryness. Horizontal grooves can follow an earlier illness, injury, or interruption in nail growth. Repeated wet work, biting, picking, skin conditions, nutritional problems, and some medicines can also change nails.

Vitamin D deficiency mainly affects bone and muscle health; nail ridges alone do not confirm it. Look at all nails and note whether the change is new, spreading, painful, discoloured, or associated with fatigue, weakness, or skin symptoms. A clinician may examine the nails and decide whether blood tests are useful.

Photograph the nail changes in good light and note when they began. Use moisturiser on the nails and surrounding skin, wear gloves for prolonged contact with water or cleaning products, and avoid cutting or scraping the nail surface. Do not take vitamin D or other supplements solely to treat ridges without knowing whether a deficiency exists.

Arrange a review for persistent, worsening, or unexplained changes, especially when several nails are affected or you also have bone pain, muscle weakness, or marked fatigue. Mention recent illness, injury, dietary changes, and nail products.

Seek prompt care for a dark streak that is widening, pigment spreading onto the surrounding skin, a nail lifting without injury, severe pain, pus, or swelling. New changes in one nail deserve examination when they do not grow out or improve.

Do these ridges look like normal growth, injury, infection, or another nail condition? Is vitamin D testing appropriate? Should iron or other nutrient levels be checked? What changes should prompt an earlier review?