4. Dark Lines Under the Nail
A dark streak or line running vertically beneath the nail can be harmless in some individuals, especially those with darker skin tones. However, if the line appears suddenly, changes shape, or spreads into the surrounding skin, it should be evaluated by a doctor to rule out serious conditions such as melanoma.
5. Brittle, Cracked, or Peeling Nails
Dry, fragile nails are often caused by frequent handwashing or chemical exposure. But persistent brittleness can sometimes be linked to thyroid disorders or vitamin deficiencies, particularly iron or biotin deficiency.
If your nails break easily despite moisturizing and proper care, a medical check-up may help uncover the cause.
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