The lack of a diamond-shaped gap when applied to the nail can be a sign of lung cancer, experts say.
Where the nail torsion is an increase in the thickness of the skin or fluid under the nails so as to prevent the formation of the shape of the diamond when applied to the presence of several diseases and in this case on lung cancer.
The appearance of nail clubbing is associated with a lung cancer-related factor in 35% of people, according to UK Cancer Research.
The same test is usually performed by doctors and specialists as a means of finding and diagnosing the disease, and in most cases, the nails are not observed by the patient.
Coagulation of the nail indicates a range of diseases that are not limited to lung cancer, including heart problems.
The link between nail clubbing and lung cancer is not yet known, but it is believed to be because tumors produce hormones that cause fluid to build up in the fingers.