But some are quite frightening, and a few are even life threatening.
Physicians classify nosebleeds into two different types.
The septum contains blood vessels that can be broken by a blow to the nose or the edge of a sharp fingernail. This type of nosebleed comes from the front of the nose and begins with a flow of blood out one nostril when the patient is sitting or standing. Posterior nosebleeds are more likely to occur in older people, persons with high blood pressure, and in cases of injury to the nose or face. Anterior nosebleeds are common in dry climates or during the winter months when heated, dry indoor air dehydrates the nasal membranes. Dryness may result in crusting, cracking, and bleeding.