Tummy cramps late menstruation by a variety of reasons, may be a common physiological phenomenon, but also may be related to some diseases, common are menstrual precursors, endocrine disorders, after taking birth control pills, pregnancy, pelvic inflammatory disease, etc., need to be judged according to the performance of different symptoms, the cause of treatment. 1, menstrual precursors: such as occasional delay in menstruation but the imminent arrival, some women can have the performance of lower abdominal cramps, can drink more hot water or Ginger brown sugar water, do not eat cold, spicy and stimulating food, such as cold drinks and chili, to avoid dysmenorrhea; 2, endocrine disorders: due to functional abnormalities or pathological changes in the endocrine system, there can be delayed menstruation, abdominal cramps, insomnia with irritability, rough skin and other symptoms, should do hormone six tests and ultrasound and other clear diagnosis, can follow medical advice to use hormonal drugs for treatment; 3, after taking contraceptives: because It is recommended to observe for a period of time, and menstruation can be resumed after the drug is metabolized. 4. pregnancy: if there is abdominal pain after menopause, blood HCG and ultrasound should be performed to confirm the diagnosis. If the pregnancy is ectopic, medication or surgical termination of pregnancy can be given according to the situation. 5, gynecological inflammation: such as pelvic inflammatory disease, endometritis, etc. Due to the decrease of immune function, change of endocrine level or invasion of exogenous pathogenic bacteria, there can be delayed menstruation, accompanied by symptoms of increased abdominal pain after exertion, intercourse and before and after menstruation.