Nosebleed refers to bleeding from the lining (mucous membrane) of the nose.

Nosebleed usually only occurs from one nostril. In addition, it most commonly occurs during childhood and usually is not serious.

In adults, most nosebleeds occur due to trauma in the form of blows to the nose. Other causes include blowing nose too forcefully; scratches from the fingernails; irritating crust formations due to colds, infections, or the flu; very dry atmospheric conditions; sudden changes in atmospheric pressure; and/or nutrient deficiencies (most commonly vitamin C and/or bioflavonoids). Reoccurring nosebleeds might be a sign of a disease condition, such as high blood pressure (hypertension), a tumor in the nose or sinuses, or an internal bleeding disorder.

Note: Blood thinners such as Coumadin or aspirin can cause a nosebleed. If this happens, notify your doctor immediately.

Caution: In cases of recurring nosebleed or a nosebleed that does not stop, seek immediate medical attention. In addition, if your nose starts to bleed following a blow to the head, it may be a sign that you have a fracture in the skull. Get to a hospital immediately.