Clubbing is a condition in which the ends of the fingers and toes
swell and the nails bulge outward. The nails wrap around the fingers or toes
and look raised, curved, and shiny.
Clubbing occurs more frequently in children born with heart defects
and people with chronic heart, lung, liver, or thyroid disease. But simple
hereditary clubbing can occur without heart or lung problems.
John Pope, MD - Pediatrics & Larry A. Latson, MD - Pediatric Cardiology