The most common reason for a nail to turn white is that the nail, or part of it, has become separated from the nail bed due to injury. Other common causes of white nails include fungal infection or a condition called Terry’s nails, which is the result of decreased blood flow to the nail bed.
Terry’s nails is characterized by white nails with dark tips, and some people develop this as they age. Other causes include liver cirrhosis, kidney disease, diabetes, anemia, or thyroid problems.

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