Nosebleed

Loss of blood from the mucous membrane that lines the nose. The most common causes of a nosebleed are fragile blood vessels, a blow to the nose, or the dislodging of crusts that have formed in the mucous membrane as a result of a common cold or infection. Rarely, recurrent nosebleeds are a sign of an underlying disorder, such as hypertension (high blood pressure), a bleeding disorder, or a tumour of the nose or paranasal sinuses.