Pain around the belly button and diarrhea can be caused by non-pathological reasons such as eating unclean food or getting cold, or pathological reasons such as acute gastroenteritis. Non-pathological causes will generally heal themselves after self-care, but pathological causes of pain around the navel and diarrhea if serious, it is recommended to go to the hospital in a timely manner to do routine blood and stool tests, and if necessary, perform colonoscopy to clarify the cause of treatment in a timely manner. Common diseases are: 1, acute gastroenteritis: there are often obvious triggers, the epigastric and umbilical perimeter can appear abdominal pressure pain. Acute gastritis due to food poisoning often coexists with acute enteritis, accompanied by diarrhea, and in severe cases, dehydration can occur. In mild cases, oral glucose electrolyte solution is given to replace fluid loss. If vomiting persists or dehydration is evident, intravenous glucose saline and other relevant electrolytes are required. If necessary, antiemetics and antispasmodics such as belladonna and montelukast can be used. 2. Ulcerative colitis: the prevalent site is rectum and colon, manifested by persistent or recurrent diarrhea, mucopurulent stools, accompanied by abdominal pain, urgency and other symptoms, often accompanied by varying degrees of systemic symptoms, but also skin, mucous membrane, joints, eyes, liver and gallbladder and other extraintestinal manifestations. Should be timely supplementation of fluid and electrolyte balance, amino salicylic acid preparations are the main therapeutic drugs; 3, norovirus infection: norovirus has strong contagious, high incidence in autumn and winter, can cause gastroenteritis. Patients may have abdominal pain, and most of the abdominal pain is located around the umbilicus. Also can be accompanied by vomiting, fever, increased number of stools. The stools may be pasty or thin, or watery. In severe vomiting, antiemetics should be given, in obvious abdominal pain, antispasmodics should be given, in high fever, oral rehydration salts should be given in mild diarrhea, and in obvious dehydration, intravenous rehydration should be given to correct disorders of water-electrolyte acid-base balance and regulate intestinal flora. In the daily diet should pay attention to hygiene, try not to drink and smoke and eat spicy and stimulating food. Pay attention to the warmth of the abdomen and drink more plain water.