The causes of stomach pain before and after ovulation may be physiological, related to the pelvic peritoneum being stimulated; they may also be pathologic, such as pelvic inflammatory disease and hormone level disruption. 1. Physiological factors: before ovulation, as the follicle further develops and matures, it indicates that the tension increases, which will cause hidden pain; after ovulation, with the rupture of the follicle, part of the follicular fluid as well as the blood invades the abdominal cavity, resulting in pelvic peritoneum due to stimulation and cause pain. 2. Pathological factors: the presence of pelvic inflammatory disease can cause pelvic adhesions, the more common clinical symptoms are lower abdominal pain and distension, sometimes accompanied by pressure and rebound pain, as well as lumbar pain and lumbago; hormone level disruption can cause pelvic blood accumulation, which in turn causes abdominal pain. Any discomfort in the clinic requires prompt medical attention, and it is recommended that physiological factors be ruled out first, and then follow the doctor’s instructions to receive examination and treatment.