Bleeding, technically known as hemorrhage (American English), haemorrhage (British English), or hæmorrhage, is the loss of blood from the circulatory system.^[1] Bleeding can occur internally, where blood leaks from blood vessels inside the body or externally, either through a natural opening such as the vagina, mouth or rectum, or through a break in the skin. The complete loss of blood is referred to as exsanguination,^[2] and desanguination is a massive blood loss. Loss of 10-15% of total blood volume can be endured without clinical sequelae in a healthy person, and blood donation typically takes 8-10% of the donor’s blood volume.^[3]