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​Symptoms and Signs – Differential Diagnosis of  Clubbing
Congenital
Acquired

Cardiovascular
Atrial myxoma
Congenital cyanotic heart disease
Infective endocarditis

Respiratory
Cancer: bronchial, mesothelioma
Cryptogenic organizing pneumonia (rare)
Fibrosis (e.g. cryptogenic fibrosing alveolitis)
Suppurative lung disease (abscess, bronchiectasis, empyema)

Gastrointestinal
aneurysm, brachia! AV malformations
Cirrhosis
GI lymphoma, malabsorption e.g. coeliac disease
Inflammatory bowel disease
Others: Thyroid acropachy (thyrotoxicosis), unilateral clubbing: axillary artery
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