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.
6. Spoon-Shaped Nails
Nails that curve upward at the edges, forming a spoon-like shape (a condition called koilonychia), may be associated with iron deficiency anemia. If you notice this unusual shape along with fatigue or weakness, consider having your iron levels tested.
7. Clubbing (Rounded, Enlarged Nail Tips)
Clubbing occurs when the fingertips enlarge and the nails curve downward over time. This condition can develop gradually and is sometimes linked to lung or heart disease. Because it often progresses slowly, many people don’t notice it right away.
If you suspect clubbing, a medical evaluation is recommended.
