The pain in the belly like menstruation can be due to pathological or physiological conditions. Physiological conditions can be due to the following reasons: first, during ovulation, when a woman has hidden stomach pain; second, during the pre-pregnancy period, which is about 3 days after menstruation, when the fertilized egg is united in bed; third, during the pre-menstrual period or menstruation. Pathological tummy pain is more common, mainly due to the following factors: first, irregular menstruation, mainly delayed menstruation or dysmenorrhea; second, women with chronic pelvic inflammatory disease, adnexitis and cervicitis; third, the pain of pre-eclampsia is like the pain of menstruation; fourth, intermenstrual bleeding, women with bleeding during ovulation will have tummy pain, according to the specific menstrual cycle and specific age and medical history The cause can be found out.