Clubbing refers to changes in the toenails and fingernails secondary to number of disorders. The non-pulmonary causes of clubbing are: - Celiac disease - Hodgkin’s lymphoma - Liver neoplasms - Hyperactive thyroid gland - GIT malignancy - Liver cirrhosis - Dysentery - Grave’s disease Reference: https://www.mountsinai.org/health-library/symptoms/clubbing-of-the-fingers-or-toes Image via: https://www.amjmed.com/article/S0002-9343(05)00896-X/abstract