The truth is that nail lines are common and do not automatically mean you have a disease. Their possible causes depend on their appearance:
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Vertical lines: Ridges running from the cuticle to the nail tip are often harmless and become more common with age. They can sometimes be associated with iron deficiency or other health conditions.
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Horizontal lines: Deep grooves across the nail, known as Beau’s lines, can develop after severe illness, physical stress, or certain nutritional problems.
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Dark or black lines: These may result from pigmentation or an injury, but a new or changing dark stripe should be assessed by a doctor.
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Brittle nails with ridges: These may be related to dryness, frequent handwashing, or occasionally an underlying medical condition.
When to pay attention: Seek medical advice if nail changes appear suddenly, affect several nails, or occur with pain, swelling, unusual discoloration, or other symptoms.
Can you tell me whether the lines on your nails are vertical, horizontal, or dark/black? I can explain what each type may mean.
