This article will discuss the different types of bleeding in more detail, including internal and external bleeding, and provide tips for first aid. In this section, we will discuss the main types of bleeding including arterial bleeding, venous bleeding, capillary bleeding, internal bleeding, and external bleeding. The causes, characteristics, and appropriate first aid for each type is also addressed. 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, genitalia or anus, or through a puncture in the skin. Heavy bleeding can come from internal organs (stomach ulcer, uterus, bowel), major external cuts, or blood-thinning medicines. Losing more than a half-cup of blood, passing large clots, or feeling dizzy can signal life-threatening hemorrhage that needs an ambulance. Signs and symptoms of internal bleeding may vary based on location, presence of injury or trauma, and severity of bleeding. Common symptoms of blood loss may include: Bleeding is the loss of blood, inside or outside the body. A hemorrhage is severe bleeding. Learn about the causes of bleeding and how to treat it. Internal bleeding happens when your blood vessels break and blood collects inside your body. There are several causes of internal bleeding that range in severity. 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 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. Find out what to do in case of hemorrhage, or bleeding. Discover how to recognize a medical emergency, the complications, and more.