What can cause a nose bleed for no phyical reason?
Nosebleeds are caused by the rupture of a small blood vessel called a capilliary in the nose. The most common cause of this is injury – a good bash to the nose will result in bleeding. The other main cause is dryness of the inside of the nose. A dry climate or heated indoor air irritates and dries out nasal membranes, causing crusts that may itch and then bleed when picked. Other causes of nosebleeds are colds, high altitude, allergies and medications. Nosebleeds can also result from a calcium deficiency. Occasionally, nosebleeds may indicate other disorders such as bleeding disorders, cancer, high blood pressure or disease of the arteries.
