After gastrectomy, the stomach is bloated, mostly due to the weakening of digestive function, intestinal function has not been fully restored and other circumstances. 1. Weakened digestive function: the cause of bloating after gastrectomy is mainly due to the fact that the human body’s stomach has been removed and the digestive function has been weakened, which will easily lead to the physiological function being affected, and the digestive and absorption function will be disorganized. Therefore, it will produce indigestion, causing the symptoms of abdominal distension. 2. Intestinal function is not fully restored: if the intestinal function is not fully restored to normal, it will easily lead to some gases produced in the intestinal tract, resulting in the inability to effectively discharge through intestinal peristalsis, resulting in postoperative bloating may occur. Patients who have stomach bloating after gastrectomy should go to the hospital in time, after clarifying the cause of the disease, and then give appropriate treatment under the guidance of the doctor.