The following causes should be considered for distension and pain below the belly button, 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 the anus stopping gas and defecation. If the abdomen gets cold, or the patient eats cold food, it may lead to gastrointestinal dysfunction, and there will be distension and pain below the belly button, often accompanied by belching. If acute gastroenteritis occurs, there may also be swelling and pain below the navel, often accompanied by fever, nausea, vomiting, diarrhea. It is recommended that patients go to the hospital in a timely manner, the need to improve the relevant tests, such as routine blood, stool routine, etc., to be able to clarify the cause, can be directed to the cause of the treatment.