Although menstrual cramping is very commonly experienced by most young women in their teen years, cramping pain that prevents a girl from participating in normal activities such as school and sports, may be a sign of endometriosis. Pain symptoms that start a day or two before menstrual bleeding starts, or pain passing bowel movements during menses are also common symptoms of endometriosis. This severity of symptoms should be evaluated by an experienced gynecology provider in order to achieve an effective treatment approach.