After metabolic weight loss surgery, the probability of postoperative vomiting is low, and the specific causes of postoperative vomiting are described below: 1. Surgical aspects: After sleeve gastrectomy, if the remaining intestine and stomach are narrow, or as narrow as the distal end of the sleeve, which is sewn during the surgery, it is more difficult to eat or drink, which can easily cause obstructive vomiting. Because of the surgical aspect involved, you should choose a regular, large, qualified hospital to do it to ensure the effectiveness of the surgery and technology to avoid vomiting caused by the surgery; 2. Own aspect: the patient’s own condition is very rare, such as patients with gastritis or related diseases, prone to vomiting symptoms after surgery. Therefore, gastroscopy should be performed before doing the surgery to determine whether the patient suffers from gastric diseases, and after excluding gastric diseases, the surgery should be performed. If there are related problems, stomach related diseases should be treated first to avoid vomiting after surgery.