The causes of pain around the navel and also diarrhea are acute gastroenteritis and appendicitis at the beginning of the attack. The onset of acute gastroenteritis is directly related to poor dietary habits and cold in the abdomen, which not only leads to inflammation of the intestinal mucosa, but also imbalance of the intestinal flora. Patients not only experience spasmodic pain in the intestinal wall, but also have diarrhea due to excessive peristaltic speed of the intestines. In the early stages of appendicitis, the pain around the navel is the main symptom, and after a few hours the pain moves to the right lower abdomen and is fixed in the right lower abdomen. Pain around the navel accompanied by diarrhea should also be alerted to the initial stage of appendicitis.