| ICD9 =| ICDO =| OMIM =| MedlinePlus = 000045| eMedicineSubj =| eMedicineTopic =| MeshID = D006470
Bleeding, technically known as hemorrhaging or haemorrhaging (see American and British English spelling differences#Simplification of ae and oe|American and British spelling differences), is the loss of blood or blood escape from the circulatory system. Bleeding can occur internally, where blood leaks from blood vessels inside the body, or externally, either through a natural opening such as the Mouth (human)|mouth, human nose|nose, ear, urethra, vagina or anus, or through a break in the human skin|skin.
Desanguination is a massive blood loss, and the complete loss of blood is referred to as exsanguination. Typically, a healthy person can endure a loss of 10–15% of the total blood volume without serious sequela|medical difficulties, and blood donation typically takes 8–10% of the donor's blood volume.