bleeding

bleeding Hemorrhaging. Losing blood, typically because of injury to blood vessels. With simple bleeding, cleaning the site of injury and applying mild pressure or a bandage is sufficient treatment. If bleeding is caused by injury to a major blood vessel, emergency care is necessary. Spontaneous bleeding in the skin can represent a serious underlying illness and requires medical evaluation. Menstrual bleeding involves the normal expulsion of uterine tissue. See also hemorrhage; menstruation.