Stomach pain followed by back pain may be caused by gastritis, peptic ulcer, pancreatitis, left ureteral stone, left kidney stone, stomach cancer and other reasons. 1. Peptic ulcer: including gastric ulcer and duodenal ulcer, in the acute attack will cause stomach pain, involving back pain, accompanied by acid reflux, heartburn, hiccups and other symptoms. 2. Pancreatitis: Acute attack of pancreatitis causes epigastric pain, which may involve stomach and lower back pain. 3. Left ureteral stone, left kidney stone: stone displacement or obstruction can lead to stomach pain and back pain. 4. Stomach cancer: cancer cells infiltrate the stomach tissues and cause stomach pain, which radiates to the lower back, and may be accompanied by black stools, weight loss, decreased appetite, anemia and other symptoms. There are many other reasons why stomach pain is followed by waist pain. It is recommended to consult doctor in time, improve examination, make clear diagnosis and follow doctor’s instruction for treatment.