Most women will experience different degrees of discomfort before the onset of menstruation, which may also be a very strong feeling of back pain, or throbbing pain in the lower abdomen as well as bloating in the stomach, which are very common physiological phenomena clinically known as premenstrual syndrome (PMS). At this time, the reason for stomach bloating is considered to be because before menstruation, women’s pelvic cavity is in a state of congestion, which will make the abdomen have a slight feeling of swelling, although it makes women very uncomfortable, but no need to deal with it, this is a normal physiological response. If the pain and distension increase, affecting the patient’s life and work, and need to take medication to relieve pain, this phenomenon is dysmenorrhea, and need to do further examination. Women’s menstruation will also be affected by a lot of emotions, environment, stress and sleep, women should not eat cold, cold food, do not get angry, and should not have intercourse during menstruation.