Excessive bleeding during the menstrual periods is also the most recurring symptom among the females who have endometriosis. The medical term for excessive bleeding is menorrhagia, which explains the abnormal bleeding during the month. The outwards growth of endometrial-like tissues can cause excessive bleeding in a lot of women. The bleeding becomes so out of control that sometimes the women are not able to handle it. Moreover, bleeding between the normal days and the menstrual period as the uterus is compromised, resulting in abnormal spotting or bleeding during regular days.