Ridges in nails can develop due to a current or past illness or injury. A healthy nail is typically smooth or has barely perceptible vertical lines running from the cuticle to the tip. When there are ...

Koilonychia, or "spoon nails," is a condition in which your nails develop a concave shape that makes them look like a spoon. Health conditions, such as iron deficiency or celiac disease, can lead to ...