What causes nose bleed?

List: Fingers! irritation, dryness, infection, malignancies hypertension bleeding disorder.

Many reasons: Nose bleed reasons: nasal congestion or nasal dryness, ^ blood pressure, excessive use of decongestants, being at ^ altitude, trauma to nose, nose picking, or blowing the nose hard. Bacterial & viral infections can ^ risk as well as bleeding disorders. Recurrent nose bleeds may be due to broken vessel in the nose. Alcohol / Cocaine abuse can cause nose bleeds, as can tumors.

Nose bleed: Bleeding from nose could be due to infection, injury, bleeding disorder, congestion of nose due to allergies like hay fever etc. Good idea to see doctor for detail history and examination to confirm the diagnosis.