Hemorrhage (or bleeding) is a commonly used term to describe a massive blood loss, which can refer to blood loss inside the body (through vessels or organs inside the body) or outside the body (loss occurring through a wound or open orifice such as the mouth or rectum).
Bleeding is a common symptom that can be caused by a variety of conditions or incidents. They can include traumatic bleeding (through injury, depending on severity) or a medical condition (such as hemophilia, leukemia, liver disease and the like).