After appendicitis, the stomach becomes bigger, mainly consider four reasons: the first point, the gastrointestinal tract function has not yet recovered, patients undergo general anesthesia surgery, laparotomy, the gastrointestinal tract function has not yet fully recovered, the intestinal tube in the abdominal cavity is mostly in the dilated state, the internal contains gas and intestinal contents, often resulting in a bigger stomach, the anus has not begun to exhaust defecation. The second point, after appendicitis, residual infection in the abdominal cavity, resulting in the slowing of intestinal peristalsis, resulting in a larger stomach. The third point, ascites formation, due to the infection still exists, the intra-abdominal exudation is obvious and ascites appears, resulting in a larger stomach. The fourth point is that some patients have cardiopulmonary insufficiency and renal insufficiency, resulting in a decrease in the amount of blood returned to the heart and more fluid leaking from the tissues, which results in ascites, leading to a larger stomach.