Hidden pain in the middle of the left abdomen is considered to be caused by chronic gastritis, gastric ulcer, intestinal infection, pancreatitis, herpes zoster and other diseases. 1. Chronic gastritis, gastric ulcer: chronic gastritis can be accompanied by pain in the left upper abdomen, abdominal distension, loss of appetite, nausea, vomiting and other symptoms; gastric ulcer patients can have symptoms of hidden pain in the middle of the left abdomen, gastric ulcer pain occurs after eating. 2. Intestinal infections: Bacteria, parasites and other infections in the left side of the intestinal tract can have symptoms of hidden pain in the middle of the left abdomen, which can also be accompanied by diarrhea and other symptoms. 3. Pancreatitis: patients with pancreatitis may have hidden pain in the middle of the left abdomen, which may be accompanied by nausea, vomiting and other symptoms, blood amylase is elevated more than three times the normal value, abdominal CT suggests that the pancreas is edematous, with peripheral exudative lesions. 4. Herpes zoster: Herpes zoster occurring in the abdomen can have localized pain symptoms before the rash appears. There are many other causes of hidden pain in the middle of the left abdomen. With the above symptoms, it is recommended to go to the hospital to improve the examination and make a clear diagnosis.