After gastrectomy surgery, patients may suffer from postoperative bleeding, poor digestive function, physical weakness and other effects. 1. Postoperative bleeding: gastrectomy is a traumatic surgery, and there will be a small amount of blood oozing from the wound in a short period of time after the surgery, and some blood vessels may be damaged during the surgery, which will lead to postoperative bleeding. 2. Poor digestive function: After gastrectomy, the volume of the stomach becomes smaller, and the digestive speed becomes slower, so it is easy to have bloating, vomiting, diarrhea and other symptoms of poor digestive function. 3. Weakness: After gastrectomy surgery, patients may suffer from dizziness, pallor, cold sweat, hunger and other signs of weakness due to damage to the operated area, impaired digestive function and insufficient supply of nutrients. After the operation, patients should pay attention to their dietary habits and go to the hospital for regular checkups; if they feel unwell, they should consult the doctor in time so as to avoid delaying their condition.