Stomach pain with a small amount of bleeding during non-menstrual periods may be related to causes such as pelvic inflammatory disease, endometrial inflammation, atypical hyperplasia of the endometrium, cancer of the endometrium, or submucosal fibroids, large intermural fibroids, endometriosis, or ovarian cysts. Bleeding. In addition, if you have stomach pain and small amount of bleeding during non-menstrual period, it is also recommended to rule out the possibility of pregnancy, because clinically, some people who have small amount of vaginal bleeding when it is time for menstruation in this month are actually not menstruating and mistakenly think that it is a decrease in menstruation, so the possibility of pregnancy is ignored. When bleeding occurs again after a period of time after what one thinks is a clean period, it may be a miscarriage or an ectopic pregnancy, so it is important to have a timely examination to rule out such a situation.