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
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