If you look at your fingernails, you’ll notice light areas at the base. These are moons, or lunulae. Their change in color, shape, or size can indicate not only the presence of a disease but also the predisposition to it. Such diagnostics help you notice the problem in time and take action.

Bright Side learned how to run diagnostics of your health with the help of lunulae.

When a lunula changes on one finger