3. Blue or Purple Tint

A bluish tint to the nails may signal low oxygen levels in the blood. This can sometimes occur in people with heart or lung conditions. If you notice blue nails along with shortness of breath, chest discomfort, or unusual fatigue, seek medical attention promptly.

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 NNails

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.