Nail clubbing occurs when the tips of the fingers enlarge and the nails curve around the fingertips.“Here, the nails take a raised, rounded appearance, like a club,” adds the health body.
“However, healthy people can have clubbing too, as it also runs in families.”
According to the Roy Castle Lung cancer Foundation, finger clubbing is sometimes seen in as many as 35 percent of people with non-small cell lung cancer, and in four percent of those with small cell lung cancer.
The Foundation cites the case of a lung cancer patient called Brian Gemmell, who said that recognising finger clubbing as a symptom of lung cancer saved his life.
