Causes of stomach protruding larger than stomach include gas swallowing, indigestion, stomach cancer, etc. Treatment includes medication and surgery. 1. Gas swallowing: when the human body involuntarily swallows a large amount of gas while eating, the phenomenon of stomach protruding larger than the stomach can occur, at this time, oral digestive enzyme tablets can be given to help relieve abdominal distension. 2. Indigestion: indigestion and bloating, at this time need to give domperidone to promote gastrointestinal peristalsis treatment. 3. Gastric cancer: patients with gastric cancer can be treated with trastuzumab and other medicines at this time, and without contraindication to surgery, they can be treated with radical gastrectomy and other surgical treatments for gastric cancer. If the phenomenon of stomach protruding is bigger than the stomach, please consult the doctor in time, and the medicine should be used under the guidance of the doctor.