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A line on your nail is not, by itself, a diagnosis.
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Different types of nail markings have completely different causes. Some are related to normal aging or minor trauma, while others may provide clues that something affected the body while the nail was growing.
Let’s take a closer look at what these lines can mean—and when they deserve medical attention.
What Are the Lines in the Picture?
The image appears to show transverse markings across the fingernail, with the arrow pointing
