Withdrawal bleeding also occurs stomach pain, usually after the application of emergency contraceptive pills, after 3-7 days will appear the withdrawal bleeding of drugs, this bleeding and menstruation is not very different. The main reason for stomach pain is due to the endometrium of the local prostaglandin secretion increases, causing the uterus too strong contraction causes, so there will be dysmenorrhea, the application of painkillers will be more effective, such as ibuprofen, anti-inflammatory pain and other painkillers, for the menstrual period when the vaginal bleeding and the emergence of pain, the effect is relatively good. At the same time, pay attention to keep warm, do not get cold, ensure enough sleep, pay attention to rest, usually after 2-3 days, the symptoms of abdominal pain will disappear.