Mnemonic: “CLUBBING”
C: Cyanotic heart disease
L: Lung disease (hypoxia, lung cancer, bronchiectasis, cystic fibrosis)
U: UC/Crohn’s disease
B: Biliary cirrhosis
B: Birth defect (harmless)
I: Infective endocarditis
N: Neoplasm (esp. Hodgkins)
G: GI malabsorption
