A black line on your nail (medically known as melanonychia) causes a streak of dark pigmentation that runs along the nail bed. It can be a normal color variation, especially in people with darker ...

But the lines were still there. Kennedy News & Media Tagliamonte went to a dermatologist, who told her the “discoloration at the base of my thumb nail ... this black line in my nail was coming ...

Longitudinal ridging, which is clinically known as onychorrhexis, occurs on the nails and may appear as vertical striations or lines that originate from the base of the fingernail and continue to ...

Changes in nail colour, shape, or texture may indicate underlying health issues or nutrient deficiencies. Nail changes can be ...

PEOPLE asked medical and nail experts to weigh in on the potential risks associated with the magnetic nail polish ...

A black line on the nail could be normal, such as when it is just a color variation. Other possible causes range from injury to certain medications for conditions like human immunodeficiency virus ...

The black lines (left) on Michelle Tagliamonte's thumb were a sign of cancer.