Haemorrhage is bleeding from a damaged blood vessel. Many things can cause haemorrhage inside and outside the body. Some common causes of haemorrhage include alcohol, drug, or tobacco use that is heavy or long-term, blood clotting disorders, cancer, complications from medical procedures such as surgery or childbirth, damage to an internal organ, hemophilia, leukemia, liver disease, menorrhagia (heavy or prolonged menstrual bleeding), thrombocytopenia (low blood platelet count), von Willebrand disease, vitamin K deficiency, and brain trauma.