The pain under the stomach may be due to urethritis, cystitis or pelvic inflammatory disease. 1. Urethritis: Urethritis can lead to the occurrence of stomach pain, this disease is mainly due to non-gonococcal or gonococcal infection. Patients will experience symptoms such as painful urination, frequent urination and itching in the urethra. Acute urethritis can cause pain in the stomach when the symptoms are severe. 2. Cystitis: after suffering from cystitis, there will be frequent urination, painful urination, urgent urination or pain in the bladder area, and some patients will also have pus or hematuria, accompanied by the symptom of tummy drop pain. 3. Pelvic inflammatory disease: Pelvic inflammatory disease can also cause pain in the stomach, which is a relatively common disease caused by reproductive tract infections, often occurring in women. This is a relatively common infection of the reproductive tract, often occurring in women. The falling pain in the stomach may also be due to female gynecological diseases or gastrointestinal diseases, the patient should consult a doctor for examination in a timely manner, and comply with the doctor’s instructions for treatment, so as to avoid delays.