Gastrectomy is only one of the surgical methods, thinness is not a contraindication to surgery, when the patient has surgical indications and meets the surgical conditions, it can be operated. When the patient has gastric ulcer, gastric polyp, gastric mesenchymal tumor, gastric cancer and other lesions, with surgical indications, the doctor will recommend the patient to undergo surgical treatment. Before the operation, a detailed and comprehensive physical examination is needed to clarify the patient’s physical quality and whether he or she has the conditions for the operation. If the patient is thin, but his physical quality is basically good and he can tolerate the surgery, the doctor will also recommend the surgery. If the patient’s quality is relatively poor, temporarily unable to tolerate surgery, the doctor will carry out conditioning treatment, when the patient has the surgical conditions before surgery. For patients who need surgery, patients should not have too much psychological burden, and actively cooperate with the doctor to complete the surgical operation. In the process of postoperative recovery, in addition to regular medication according to the doctor’s instructions, early postoperative intravenous nutritional therapy. After being able to eat, you must eat a reasonable diet. Pay attention to fresh vegetables, fruits, eggs, milk, lean meat and other foods rich in high-quality protein and vitamin intake, strengthen the body quality, conducive to the smooth recovery of the body after surgery.