significant fatigue or other unexplained symptoms
Causing the nail to separate from the skin
Associated with a new dark streak or rapidly changing discoloration
A new dark streak or spot under a nail, particularly if it changes or extends onto the surrounding skin, should be evaluated rather than assumed to be a harmless bruise.
Bottom Line
Brittle nails don’t necessarily mean your body is missing a particular vitamin. Water exposure, nail treatments, aging, trauma, fungal infections, skin conditions, thyroid problems, and iron deficiency can all contribute.
The best first steps are gentle nail care, protection from prolonged water and chemicals, and a balanced diet. Persistent or unusual changes deserve a professional evaluation rather than self-treating with high-dose supplements.






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