Soreness in the lower abdomen during menstruation is a manifestation of dysmenorrhea, the reason why dysmenorrhea is related to the following factors: 1, it may be caused by inflammation, when there is inflammation in the pelvic cavity, the tissues will be in a state of congestion, and the congestion will be aggravated by menstruation, so it will be painful, soreness and swelling. 2, it may be due to uterine developmental deformities, the uterus will be discharging menstrual blood inside the uterine cavity when having a menstrual period, and the uterus will be in discordant The contraction of the uterus will be uncoordinated, resulting in pain in the lower abdomen.3. Clinically, it may be caused by adenomyosis or endometriosis, which often manifests as progressive worsening of dysmenorrhea, and may increase the amount of menstrual flow.4. Clinically, it may be caused by the endometrial lining of the uterus shedding during menstruation, which releases prostaglandins and causes pain in the lower abdomen.