text: Most common causes of epistaxis (nosebleed) are:\n1. Trauma (accidental..or nose picking-seriously)\n2. Inflammation (infection, allergy, drug abuse-cocaine for example, dryness)\n3. Foreign body\n4. Coagulation disorder\n5. And yes other things like hypertension, anti-coagulant usage, excessive alcohol intake.\n\nYou said that it didn't clot, but eventually stopped? Either way, consult with your physician to make sure it's nothing more serious, soon.