The two days ahead of the menstrual period, back pain menstrual blood for coffee-colored may be physiological factors, may also be the cause of pathological factors, such as pelvic congestion, endocrine disorders and so on. 1. Physiological factors: menstruation two days in advance or push back two days are normal phenomena, back pain is usually due to blood loss in the body, menstruation coffee-colored is generally due to poor circulation of menstrual blood, menstrual blood in the uterus residual time is too long, the oxidation of the reasons. These are normal physiological phenomena, usually do not need to do special treatment, the second or third day of menstruation, the symptoms will be relieved. 2. Pathologic factors: (1) Pelvic congestion: Pelvic congestion will easily lead to insufficient blood supply and poor circulation in the pelvis and the muscles of the waist, resulting in the patient’s menstruation two days earlier, lumbar acidity, menstrual blood is coffee-colored, and it may be accompanied by abdominal distension and pain. (2) Endocrine disorders: endocrine disorders can easily lead to a sudden decrease in estrogen levels in the body, resulting in the relaxation of local muscular ligaments, which can cause the patient to have a period two days early, with back pain and coffee-colored menstrual bleeding. In addition, vaginitis, cervicitis, uterine fibroids, etc., may also lead to the patient’s menstruation two days early back pain and coffee-colored, you need to go to the hospital to do a comprehensive examination, and then cooperate with the doctor for treatment.