What are the causes of clubbing?

Cardiovascular	Infective endocarditis Cyanotic congential heart disease Atrial myxoma
Respiratory	Lung cancer (all except small cell) Chronic suppurative lung disease (cystic fibrosis, bronchiectasis, lung abscess, empyema) Pulmonary fibrosis [NOT COPD]
Gastrointestinal	Inflammatory bowel disease (or other cause of chronic malabsorption) Cirrhosis GI Lymphoma
Other	Thyrotoxicosis (thyroid acropachy) Hereditary