causes of nose bleed
The most common cause of anterior nose bleeds is trauma such as a blow, smack, or sometimes just picking the nose. Dryness inside of the nose can also cause bleeding. In addition, high altitudes, colds, allergies, and medications are all potential culprits for triggering a nosebleed. Smoking can dry out the nose too, so quitting is especially important for recurrent nosebleeds, among many other health benefits.
Besides nose picking, dryness, trauma, and forceful nose blowing, there are other less common causes of nosebleeds (some of which can predispose a person to frequent nosebleeds) like: 1  Certain blood-thinning medications (for example, aspirin) 2  Certain drugs (for example, cocaine)