Epistaxis

Nasal trauma, eg, nose picking, forceful nose blowing, foreign body
Allergic rhinitis or viral rhinitis
Dry nasal mucosa
Deviated septum
Chronic sinusitis
Inhaled steroids
Cocaine use
Alcohol use
Antiplatelet drugs, eg, aspirin, clopidogrel
Thrombocytopenia, eg, idiopathic thrombocytopenic purpura, thrombotic thrombocytopenic purpura
Hemophilia
Hereditary hemorrhagic telangiectasia (Osler-Weber-Rendu syndrome)
Polycythemia vera
Leukemia
Wegener’s granulomatosis
Nasal tumor