What are the different types of bleeding, and how can a person treat them? Read on to learn more. Hemorrhage involves internal or external bleeding from damaged vessels. It causes symptoms like dizziness, pale skin, and, in severe cases, organ failure. Bleeding can be caused by injuries, or it can be spontaneous. Spontaneous bleeding most commonly occurs with problems in the joints, or gastrointestinal or urogenital tracts, often in people who have a bleeding disorder or who take a blood thinning medicine. Bleeding may be life-threatening when the amount of blood present is equal to about half of what a soda can contains. In a small child or infant, bleeding may be life-threatening when the amount of blood loss is even less. Flow is the movement of blood. Blood that is flowing continuously, or spurting, is a sign of life-threatening bleeding. Bleeding and blood clotting, escape of blood from blood vessels into surrounding tissue and the process of coagulation through the action of platelets. The evolution of high-pressure blood circulation in vertebrates has brought with it the risk of bleeding after injury to tissues. Mechanisms to This type of bleeding is usually minor in nature and often does not require medical intervention. However, if the blow causes a lesion in the skin, it will cause external bleeding. Blood clots are usually able to prevent blood from flowing through small lesions. Find out what to do in case of hemorrhage, or bleeding. Discover how to recognize a medical emergency, the complications, and more. Bleeding, hemorrhage, haemorrhage or blood loss, is blood escaping from the circulatory system from damaged blood vessels. Bleeding can occur internally, or externally either through a natural opening such as the mouth, nose, ear, urethra, vagina, or anus, or through a puncture in the skin. Hypovolemia is a massive decrease in blood volume, and death by excessive loss of blood is referred to. Bruising or bleeding after an injury is normal (see also How Blood Clots). However, some people have disorders that cause them to bruise or bleed too easily. Sometimes people bleed without any obvious triggering event or injury. Spontaneous bleeding may occur in almost any part of the body, but it is most common in the nose and mouth and the digestive tract. People with hemophilia often bleed. Internal bleeding (hemorrhage) happens when your blood vessels burst or break and blood collects inside your body. This is different from external bleeding — when you bleed due to a wound that breaks your skin.