The most common causes of early vomiting in postoperative patients include the following: 1. Consider that it is caused by anesthesia, as anesthesia needs to be induced before surgery, certain anesthetics can easily cause impaired gastric emptying, which can lead to nausea and vomiting. In addition, the application of opioid analgesics may be appropriate in the process of anesthesia, which may also cause reflex vomiting; 2, consider that it is caused by trauma factors such as surgery. If the patient vomits intensely after surgery, it is necessary to fast temporarily and cooperate with intravenous supplemental nutrition and other symptomatic treatment.