Common causes of swelling on the right side of the stomach include appendicitis, intestinal obstruction, etc. Treatment includes medication such as antibiotics and surgery. 1. Appendicitis: Appendicitis is an inflammation of the appendix caused by blockage of the lumen of the appendix due to various factors. Typical symptoms of appendicitis are pain in the lower right abdomen, and acute appendicitis often manifests metastatic lower right abdominal pain and abdominal distension. Treatment includes medication such as ceftriaxone sodium, metronidazole, etc., and surgical resection such as laparoscopic surgery is often used in severe cases. 2. Abdominal wall hernia: mostly due to the weakness of the local abdominal wall caused by the limited protrusion of the intestinal tube, patients usually have no clinical symptoms, and occasionally there can be touching the presence of a limited mass, feasible hernia sac repair. 3. Intestinal obstruction: patients with intestinal obstruction have different clinical manifestations due to different causes. The main symptoms are paroxysmal abdominal cramps, abdominal distension, inability to defecate and exhaust. Treatment includes general treatment such as fasting and water retention, gastrointestinal decompression, etc., mainly through surgical treatment such as intestinal resection and intestinal anastomosis. Medication needs to be chosen under the guidance of a doctor. When patients experience discomfort, they should go to the hospital immediately.