Abdominal pain after chemotherapy for stomach cancer may be caused by chemotherapeutic drugs damaging the mucous membrane of gastrointestinal tract, resulting in ulcer of gastrointestinal mucous membrane. At this time, you can take orally or infuse drugs to inhibit gastric acid secretion, or take oral drugs to protect gastric mucosa, and the pain may be reduced. If the pain is more serious, you can also take oral pain medication, in the diet to eat more easily digestible food. If you eat vegetables that contain more fiber, or meat that contains more fat or protein, it may cause abdominal pain to worsen. If abdominal pain occurs, it is also necessary to identify whether it is a gastric perforation after chemotherapy, or intestinal obstruction, which requires symptomatic treatment.