Beau’s lines are horizontal indentations or ridges across fingernails or toenails, sometimes with a yellowish tint. They ...

Nail changes can reveal hidden health issues long before other symptoms appear. Here's what to watch for and why it matters.

or horizontally across the nail (known as Beau lines). Most fingernail ridges are harmless, especially vertical ridges that ...

Michelle Tagliamonte, 58, was getting a manicure when she noticed the black lines on her thumb, which signaled the start of a fast-spreading cancer.