After gastric cancer is detected by gastroscopy, many patients are at a loss of what to do in the face of the sudden nightmare, and even after hospitalization, they are still many confused about what to do next? For patients with gastric cancer suitable for surgery, I will give you a general introduction of the treatment process after hospitalization and before surgery: 1. First of all, the patient will go to see a gastrointestinal oncology surgeon. The doctor will conduct detailed medical history inquiry and physical examination. Patients with cardiac, cerebral and pulmonary complications will also need to invite a specialist for consultation to guide the perioperative treatment. 2. Routine blood tests before surgery: routine blood, biochemistry, arterial blood gas analysis, eight preoperative infections, coagulation, urine and stool routine, serum tumor markers, etc. Auxiliary examination of cardiopulmonary system: electrocardiogram, cardiac ultrasound, ambulatory electrocardiogram, pulmonary ventilation and respiratory function. Imaging examinations: upper gastrointestinal tract imaging, thin CT scan of the chest, enhanced MRI of the liver, enhanced CT examination of the whole abdomen and pelvis, PET-CT examination if necessary. 3. Ultrasound endoscopy (EUS) may be performed in other cases as appropriate. Puncture biopsy and genetic testing for metastases. After perfecting the examination, clear diagnosis and excluding contraindications to surgery, surgery can be arranged. Traditional gastric cancer surgery, which is an open surgery, requires a large and long incision from under the sternal process of the sternum, up to a few centimeters below the navel. The picture below shows the traditional open radical gastric cancer surgery: laparoscopic minimally invasive surgery just pokes a few small holes in the abdominal wall to complete a more delicate and thorough gastric resection and lymphatic dissection than open surgery.