Nausea and vomiting after colonoscopy may be caused by anesthesia reaction, or it may be caused by acute gastroenteritis, gastrointestinal dysfunction and other disease factors caused by digestive system diseases. 1. Anesthesia reaction: If the patient is under general anesthesia for colonoscopy after the end of colonoscopy, the anesthesia drug in the body has not been completely metabolized, which may cause nausea, vomiting, dizziness and other uncomfortable symptoms. 2. Disease factors: when bacteria, viruses and other pathogenic microorganisms infect the intestinal tract, acute gastroenteritis can occur, resulting in nausea, vomiting, may also be accompanied by diarrhea, abdominal pain symptoms; anxiety, nervousness, depression and other adverse emotional stimuli can be triggered by gastrointestinal dysfunction, gastrointestinal dysfunction will appear nausea, vomiting symptoms. Nausea and vomiting after colonoscopy is recommended to go to the hospital after exclusion of anesthesia.