The possible causes of stomach pain after spinal surgery include stress reaction, drug effects, digestive system diseases and so on. 1. Stress reaction: because the pain after spinal surgery is more obvious, stimulating the gastric mucosa, causing gastric mucosal damage or too much tension and anxiety after surgery, can cause stomach pain. 2. Drug effects: because the pain after spinal surgery is heavy, need to use painkillers to symptomatic pain, because drugs have side effects, some drugs can damage the gastric mucosa, causing symptoms of stomach pain. 3. Digestive system diseases: If you have previous digestive system diseases, such as gastric ulcer, duodenal ulcer, etc., due to the need to fast for a period of time before the operation, and because of the effect of anesthesia can not eat immediately after the operation, due to the lack of food, the gastric mucosa by the gastric acid stimulation, it may also induce gastroparesis. The causes of stomach pain after spinal surgery are comparable, and it is recommended to clarify the cause of the disease and treat it under the guidance of the doctor.