Stomach pain after lung surgery is considered as a possible cause of stress gastritis or gastric ulcer, stomach upset after prolonged fasting. Surgical options for lung surgery include traditional open chest direct surgery and minimally invasive thoracoscopic surgery. No matter which kind of surgery is performed, it will cause greater trauma to the organism, which can lead to microcirculation disorders of the gastric mucosa, ischemia, decrease of the barrier function of the mucosa, increase of the secretion of gastric acid, damage to the gastric blood vessels and mucous membranes, and cause mucous membrane erosion, which can lead to gastric ulceration in severe cases, and then postoperative gastric pain. Both surgical methods are general anesthesia surgery, and both need to fast for a period of time before and after surgery. Prolonged fasting may also cause stomach discomfort, stomach cramps, stomach pain and other symptoms. Stomach pain after lung surgery can be relieved after symptomatic treatment with acid-suppressing and stomach-protecting therapy, and it is recommended to standardize the treatment under the guidance of professional doctors.