The causes of delayed menstruation and vague pain in the stomach are as follows: 1, ectopic pregnancy: after pregnancy, a priori miscarriage will also appear vague pain in the stomach. Ectopic pregnancy, which is also common in the clinic after pregnancy, will also have delayed menstruation, abdominal pain, some may be accompanied by a small amount of curry or a small amount of blood, but it is not menstruation. Through the urine pregnancy or blood test blood HCG level, combined with gynecological ultrasound for diagnosis; 2, cervical tube adhesion: after the operation, there is no menstrual push back, vague pain in the stomach, but there is no menstruation, to consider whether there is a cervical tube adhesion, after the abortion, it is recommended to review about 30-40 days; 3, pelvic inflammatory disease: chronic pelvic inflammatory disease or adnexal inflammatory disease from the lower abdomen may appear hidden pain; 4, Other factors: nervousness, mental stress leads to pain in the lower abdomen. Therefore, delayed menstruation stomach pain is recommended to the regular hospital timely medical treatment, for proper diagnosis and treatment.