• 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

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