Ridges in fingernails can run horizontally or vertically.1 They are common and harmless, but some fingernail ridges — particularly horizontal ones — can indicate a health problem such as a thyroid issue.
Source: Verywell Health
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Ridges in fingernails can run horizontally or vertically.1 They are common and harmless, but some fingernail ridges — particularly horizontal ones — can indicate a health problem such as a thyroid issue.
Source: Verywell Health
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