White lines running across nails

Whitespots or streaks are normal and nothing to worry about, but parallel white lines that extend all the way across the nails, known as Muehrcke's lines, are a sign of low levels of proteinin the blood. In contrast to Beau's lines , they're not grooved. They can occur as a result of liver disease or malnutrition.

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Medically Reviewed by a doctor on 21 Dec 2018