Heavy menstrual pain in the stomach may be caused by hormonal imbalance during menstruation, or it may be caused by gynecological diseases such as adenomyoma and endometriosis. During menstruation, the endometrium releases prostaglandins, a hormone that stimulates the uterus to experience endometrial spasms, causing pain. Most of them are normal, and you need to take rest and do not exert yourself during menstruation. When suffering from endometriosis, uterine adenomyoma and other common diseases of women, will also appear the symptoms of increased menstrual flow and abdominal pain, general painkillers may not be effective, you need to go to the hospital for relevant examinations, for the cause of the symptomatic treatment. Occasional menstrual cramps and abdominal pain are usually not a big problem, and you should pay attention to rest. If the symptoms persist, do not improve or even aggravate, you should go to the hospital in time to improve the relevant examination, under the guidance of the doctor standardized treatment.