Here’s what different lines in your nails may indicate about your health:
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Vertical lines (ridges)
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Very common, especially with aging
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Usually harmless
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Can be linked to mild dehydration or vitamin deficiencies (like B12 or magnesium)
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Horizontal lines (Beau’s lines)
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May signal past illness, high fever, or major stress
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Can appear after surgery, infection, or trauma
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Sometimes linked to conditions like diabetes
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Deep horizontal grooves across all nails
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Could suggest a serious illness or systemic health issue
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May follow severe infections or chemotherapy
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White lines (Mees’ lines)
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Can be associated with certain infections or heavy metal exposure
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Sometimes linked to kidney or liver problems
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Dark vertical lines
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Often harmless (especially in people with darker skin)
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Should be checked if they appear suddenly or change — rarely, they can signal skin cancer under the nail
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If nail changes are new, worsening, or paired with other symptoms, it’s best to see a healthcare professional.
