The reaction of the first few days of menstruation may include abdominal pain, breast tenderness, gastrointestinal dysfunction, emotional instability, etc., but there are large individual differences. Generally speaking, the pelvic cavity will gradually become congested during the premenstrual period as well as the secretion of prostaglandins, which may lead to lower abdominal or lumbar discomfort and painful uterine contractions in some women. At the same time, the effect of estrogen may also lead to breast swelling and pain, and diarrhea and other gastrointestinal disorders, and a small number of patients may also manifest migraine or emotional instability. Mild pre-menstrual discomfort usually does not require special treatment. However, if the symptoms are more serious, it is recommended to consult a doctor in time and choose the appropriate method of treatment.