Old fart is a manifestation of active intestinal tract, accompanied by pain around the navel, mainly considered as digestive system diseases, such as functional dyspepsia, acute gastroenteritis, appendicitis, etc. 1.Functional dyspepsia: it is a group of clinical syndromes caused by stomach and duodenal dysfunction, without organic diseases, which may manifest as postprandial fullness, mid and upper abdominal pain, nausea, etc. Old fart may also occur. If the patient does not find obvious abnormalities through history taking, physical examination, gastroscopy and other examinations, this disease is more likely; 2. Acute gastroenteritis: it is an acute inflammation of the gastrointestinal mucosa, which may only show abdominal pain and old farts in the early stage, but also nausea, vomiting, diarrhea, fever and other symptoms in the later stage, which need to do stool routine, stool culture and other examinations for clear diagnosis; 3. Appendicitis: the typical symptoms of appendicitis are metastatic Right lower abdominal pain, abdominal pain episodes begin around the umbilicus and can be transferred to the right lower abdomen in a few hours, and inflammation can stimulate the intestinal tract, so that the bowel sounds are active and farting increases, which can be combined with the patient’s specific clinical manifestations to make a preliminary diagnosis, and if necessary, do ultrasound, abdominal CT and other examinations.