What do white lines on the nails mean?

 

Fingernails can reflect a lot about our daily well-being. The appearance of white lines or spots, generally known as leukonychia, is a common finding and, in most cases, does not indicate a serious problem.

These marks can appear as tiny dots, fine horizontal or vertical lines, or larger whitish areas. Their appearance varies depending on their origin: sometimes they arise from micro-impacts on the nail matrix (aggressive manicures, pressure from footwear, minor trauma) and other times from chemical irritation related to nail polish, nail polish remover, or detergents.

It is also common for the nail plate to show ridges and changes in texture over time, which are part of normal aging.

Common causes and how to distinguish them

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Continued on the next pageWhen white lines appear after an intensive manicure or after bumping your fingers, they are most likely minor injuries that will move towards the tip as the nail grows. If you’ve used harsh products or over-trimmed the cuticle, the surface may only be dull or brittle for a few days.

In people who perform manual labor, play contact sports, or wear tight shoes, repeated friction can also cause these lines. In other cases, the lines may be related to periods of illness, high fever, or physical stress that temporarily interrupt nail growth and leave visible marks.