Cross-striations: a message not to be neglected:

Known as Beau’s lines , these horizontal grooves indicate that nail growth has been temporarily interrupted. Possible causes include significant stress, severe infection, or recent surgery . Their presence on multiple fingers simultaneously could indicate systemic problems such as metabolic imbalances or chronic conditions.
Horizontal white spots: a possible liver indicator:

Muehrcke’s lines , pale bands that seem to disappear when the nail is pressed, are often linked to a decrease in blood proteins . They can sometimes reflect liver or kidney problems . Although generally benign, their multiple occurrence warrants medical advice .
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