Endometrial thickening with abdominal pain may be caused by the following reasons: first, pregnancy, at this time the fertilized egg has not yet bedded down in the uterine cavity, but the endometrium has already appeared to thicken, and the diagnosis can be made clearly by drawing blood for blood HCG. In addition, if abdominal pain occurs, it may be caused by progesterone deficiency. When blood is drawn for blood HCG, progesterone should also be checked to find out whether progesterone is normal. Secondly, there is inflammation of the endometrium, so it will lead to abnormal thickening of the endometrium, mainly due to inflammation stimulation leading to tissue hyperplasia, and thickening of the endometrium, and because of inflammation, it is often accompanied by lower abdominal pain, the usual vaginal discharge will be relatively more, and it often leads to pain in the lower abdomen, especially at the time of menstruation when the symptoms of abdominal pain are more obvious, it is recommended to do if necessary Diagnostic curettage is recommended if necessary to clarify the diagnosis.