Sigmoid colon pain and stomach pain can be distinguished by the location of pain, clinical manifestations and medical aids. 1. Pain location: the pain of sigmoid colon pain is usually palpable in the left lower abdomen. Stomach pain is usually dominated by the upper abdomen, but if the pain is severe, it can present radioactive pain to the lower abdomen or the back. 2. Clinical manifestations: sigmoid colon pain is mainly manifested as lower abdominal pain, abdominal distension, mucopurulent blood stool, diarrhea, constipation and other symptoms. The main symptoms of stomach pain are gastric distension, nausea, vomiting, acid reflux and heartburn. 3. Medical auxiliary examination: sigmoid colon pain needs to be examined by doing colonoscopy or x-ray barium enema, stomach pain needs to be examined by doing Helicobacter pylori test or carbon 13 or carbon 14 breath test and gastroscopy. If the patient has abdominal pain, it is recommended to consult a doctor in time, after a clear examination, under the guidance of the doctor for treatment.