You are in Medical Library . Causes Sudden trauma to the nose, very cold or very dry air, fragile blood vessels, nasal sprays, strenuous exercise , or fingering the nose cause most nosebleeds . Recurrent nosebleeds may be a symptom of an underlying disorder such as high blood pressure , taking large doses of aspirin or blood thinning medication, allergies , a bleeding disorder , or a tumor of the nose or sinuses.
Most nosebleeds come from blood vessels in the front of the nose.
Considerations Nosebleeds are very common. A nosebleed may be caused by trauma such as fingering the nose, forceful nose blowing, direct impact to the nose, and similar situations. A nosebleed may also be caused by irritation or dryness of the lining of the nose, which may occur with low humidity and dry environment, allergic rhinitis , colds , or sinusitis . Deviated septum, foreign objects in the nose, or other nasal obstruction may cause also cause nosebleeds. Most nosebleeds occur on the tip of the nasal septum, which contains many fragile, easily damaged blood vessels.