Occasional vague pain in the stomach when a woman is menstruating may be due to cold or poor flow of menstrual blood, at first there will be vague pain in the stomach, with the increase in menstrual bleeding, the pain will be relieved, is a normal phenomenon, can be relieved after appropriate rest, eat warm food and porridge. If a woman often has vague pain in her stomach during menstruation, she needs to go to the hospital for a gynecological ultrasound to see if there are abnormalities such as ovarian cysts or corpus luteum cysts or pelvic inflammatory disease in order to give symptomatic treatment. When a woman has endometriosis, such as chocolate cysts or adenomyoma, she may also have vague stomach pain, and may be given pain medication such as ibuprofen or require surgery.