That headline is much stronger than the medical evidence supports. There is no fingernail feature that can reliably predict an individual’s life expectancy.
Some nail changes can, however, provide clues about underlying health conditions:
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Clubbing: enlarged, rounded nail tips can be associated with certain lung, heart, gastrointestinal, or other diseases.
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Spoon-shaped nails (koilonychia): may occur with iron-deficiency anemia, although there are other causes.
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White nails: can have several causes, including trauma, fungal infection, medications, or certain systemic diseases.
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Yellow, thickened nails: commonly occur with fungal infections, but can occasionally be associated with other conditions.
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A new dark streak: often results from benign pigmentation or trauma, but a persistent or changing dark streak can rarely represent subungual melanoma and should be assessed by a clinician.
One commonly circulated claim involves Terry’s nails, where most of the nail appears white with a narrow band of normal color near the tip. They can occur with aging and have also been associated with liver disease and other systemic conditions. They do not provide a reliable countdown of how long someone will live.
If you notice a new nail change that persists, rapidly changes, affects only one nail, or is accompanied by other symptoms, have it examined rather than trying to interpret it as a prediction of longevity.
