The symptoms of stomach pain during menstruation after ovulation are often caused by gynecological inflammation or primary dysmenorrhea. 1. Gynecological inflammation: When a woman has intercourse during ovulation, if both or one of the parties do not pay attention to pubic hygiene, it is very likely that a large number of pathogenic microorganisms will enter the woman’s vagina, causing cervicitis, pelvic inflammatory disease and other gynecological inflammation to occur. When a woman is menstruating, these gynecological infections are likely to worsen, resulting in the symptoms of menstrual stomach pain. 2. Primary dysmenorrhea: During menstruation, many women have higher levels of prostaglandins in the uterus and are prone to stomach pain. This type of primary dysmenorrhea can occur whether or not there has been intercourse during ovulation. If a woman frequently experiences stomach pain during menstruation, she should see her gynecologist to identify the cause and treat it under her doctor’s supervision.