This simple fingernail test could help save you from lung cancer

Human lungs with tuberculosis illustration.

Doctors advise a simple fingernail test that may help detect lung cancer early.

To perform the test, press your index fingers together and look for a small, diamond-shaped gap of light between them.

If this “diamond gap” is missing, it could indicate finger clubbing—a condition where the fingertips swell, causing the nails to curve.