There are several reasons for stomach pain without menstruation: first, to consider whether there is early pregnancy. It may be early pregnancy followed by signs of miscarriage, so go to the hospital for relevant examination and clear diagnosis; secondly, it is possible that menstruation is pushed back. In some women, this is clearly experienced and can be promoted by using some regulating drugs. Diseases including uterine fibroids, pelvic effusion, ovarian cysts, etc. can cause pain in the lower abdomen but no menstruation is present. In short, for women with stomach pain and no menstruation, it is important to go to the hospital early to identify the cause and treat the symptoms.