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What do fingernails split vertically?

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Quick Answer

If the nails are brittle or have splits or jagged edges along with vertical ridges, it may indicate onychorrhexis, notes WebMD. Onychorrhexis often results as a side effect of lichen planus, a skin rash. It can also indicate an underactive thyroid gland or anemia.

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Full Answer

On their own in otherwise healthy nails, vertical ridges in the nail that run from the cuticle to the tip of the nail are normal and a result of aging. These ridges do not indicate a health problem or injury and are harmless. Vertical ridges increase in prominence and number with age. By contrast, lines that run vertically on the nail may indicate a health issue and require evaluation by a medical professional, reports WebMD.

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