Your stomach may hurt after sex for several possible reasons, including gynecological conditions that affect the uterus or pelvic organs. This pain is usually felt in the lower abdomen and can vary depending on the cause.
Pain after sex is known as dyspareunia. In some women, it can happen before, during, or after sexual activity and may affect the genital area as well as the lower abdomen.
Common causes include lack of lubrication, pelvic floor muscle dysfunction, a tilted or retroverted uterus, sexually transmitted infections (STIs), pelvic inflammatory disease, endometriosis, uterine scarring from infections or surgery, and cervical cancer.
You should see a gynecologist to determine the cause and receive appropriate treatment. Depending on the diagnosis, treatment may include antibiotics, pain relief medication, or, in some cases, surgery.