The following reasons should be considered for the painful distension below the navel, namely intestinal obstruction, gastrointestinal dysfunction, and acute gastroenteritis. If intestinal obstruction occurs, there will be distension and pain below the belly button, often accompanied by abdominal distension, nausea and vomiting, and even accompanied by anal stoppage of exhaustion and defecation. If the abdomen is cold, or if the patient eats cold food, it may lead to gastrointestinal dysfunction and distension and pain below the belly button, often accompanied by belching. If acute gastroenteritis occurs, distension and pain may also occur under the navel, often accompanied by fever, nausea, vomiting, and diarrhea. Patients are advised to go to the hospital in a timely manner and need to improve the relevant tests, such as blood routine and stool routine, to be able to clarify the cause, which can be treated for the cause.