The most common reasons for a nosebleed in healthy adults are dry air and nose picking, explains Mayo Clinic. Allergies, aspirin use, blood thinners and foreign bodies in the nose may also cause the nose to bleed. Some of the less common reasons for nosebleeds are nasal polyps and alcohol.
To treat a mild nosebleed, a person should sit upright and lean forward, claims Mayo Clinic. This helps reduce the pressure on the veins of the nose and keeps the person from swallowing blood. A person should also use the index finger and thumb to pinch the nostrils shut, even if just one side of the nose is bleeding. The individual should breathe through the mouth and pinch the nose for five to 10 minutes. This can be done for up to 15 minutes.
A person who is experiencing nosebleeds should seek emergency medical care if there is a large amount of blood, or it is difficult for the person to breathe, according to Mayo Clinic. Emergency medical treatment should also be sought out if bleeding does not stop after 30 minutes of compression, or if the bleeding is associated with an injury. If experiencing a nosebleed, a person should not drive himself to the emergency room. He should ask someone for a ride or contact an ambulance.