What can cause clubbing of the fingers besides the obvious chronic hypoxemia?

Many dieases cause: Endocarditis, other heart diseases heart disease interstitial lung disease, cystic fibrosis bronchiectasis cystic fibrosis bronchiectasis gastrointestinal and hepatobiliary cirrhosis eisenmenger syndrome hyperthyroidism pseudoclubbing vascular anomalies of the affected arm such as an axillary artery aneurysm (in unilateral clubbing) thymoma thalassemia.

Clubbing...: Clubbing is a nonspecific finding that can be seen in both benign and malignant conditions. Often clubbing is related to an intrathoracic process particularly involving the heart or lungs.