The most common causes of nose bleeds are dryness that can be caused by indoor heat in the winter and also by, sorry, nose picking. These 2 things work together in that nose picking occurs more often when mucus in the nose is dry and crusty.
Other, less common, causes include injuries, colds, allergies or cocaine use. Children may stick small objects up the nose. Older people may have hardening of the arteries, infections, high blood pressure and blood clotting disorders, or they may be taking drugs like aspirin that interfere with blood clotting. Sometimes, the cause of nosebleeds can't be determined.
The nose has many blood vessels in it to help warm and humidify the air you breathe. These vessels lie close to the surface, making them easy to injure.
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