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

Discoloration around the lips and tongue may appear gray or white in people with darker skin, and the bluish tinge may be more visible on the palms of the hands, soles of the feet, nail beds ...

In Western medicine, tiny dark red spots on the nails, known as splinter haemorrhage, may suggest a potential heart problem, while a patch of tar yellow in the nail bed is typical of psoriasis ...