In this case, it is necessary to exclude the possibility of pregnancy-related diseases, especially the possibility of ectopic pregnancy. In this case, HCG examination and ultrasound examination should be performed. If the ultrasound suggests that there are corresponding uneven echoes on one side of the bilateral adnexal area, or HCG is positive, then the possibility of ectopic pregnancy should be considered, and the corresponding diagnostic and therapeutic procedures should be carried out according to the ectopic pregnancy. If the possibility of pregnancy-related diseases is ruled out, then the diagnosis and treatment process of abnormal uterine bleeding should be followed. Because of the lower abdominal pain at this time, after the corresponding gynecological examination, if there is the possibility of pelvic inflammatory diseases, after giving the appropriate anti-inflammatory treatment and then subsequent hysteroscopy to find out whether there is any abnormal growth in the uterine cavity.