Headlines about a “fingernail sign that predicts your life expectancy” are often exaggerated. No fingernail feature can accurately predict how long someone will live. However, nails can sometimes provide clues about general health because changes in nails may be associated with certain medical conditions.
Some nail changes worth paying attention to include:
- New clubbing (enlarged, rounded fingertips with curved nails): Can be associated with some lung, heart, or digestive conditions and should be evaluated.
- Pale nails: May occur with anemia or other health issues.
- Yellow, thickened, or brittle nails: Can be caused by fungal infections, skin conditions, or other factors.
- White lines or unusual discoloration: Some patterns may relate to nutritional issues, medications, or medical conditions.
- A dark streak under a nail that is new or changing: Should be checked by a healthcare professional to rule out serious causes.
For long-term health and longevity, factors with much stronger evidence include:
- Not smoking
- Regular physical activity
- Healthy blood pressure and cholesterol levels
- Balanced nutrition
- Good sleep
- Maintaining social connections and mental wellbeing
- Regular medical checkups when appropriate
If you saw a specific claim about a fingernail sign (for example, a white spot, vertical ridge, half-moon, or a dark line), describe it and I can explain what it may mean.
