Melanonychia, a black line on your nail, can be a sign of melanoma or benign pigmentation changes. Injuries, medications, and conditions like hyperthyroidism may also cause dark lines on your nails.

Most people give their fingernails about three seconds of attention each day, usually just enough time to notice they need a trim. But if you slow down and actually look at them, there are lines, ...

If you are staring at a dark spot under your fingernail, you may want to see a dermatologist. It could be a form of melanoma. "It is rare, and it's scary that it's rare, because a lot of people would ...

When doctors examine patients, they often look beyond the presenting symptoms to gather additional diagnostic information. Fingernails, frequently overlooked by patients, provide physicians with ...

If you've suddenly noticed vertical or horizontal ridges on your nails, it's natural to wonder why. We asked experts to explain the most common causes of fingernail ridges and what you can do about ...