Nausea and vomiting is the inability of the gastrointestinal tract to retain stomach contents for various reasons and is expelled by reflex vomiting. Under normal circumstances nausea and vomiting is the body’s self-protection, when encountering external stimuli, the reflex of nausea and vomiting will occur to protect the gastrointestinal tract from further damage. Patients with chronic nausea and vomiting, even accompanied by epigastric pain, acid reflux and heartburn, may have digestive tract diseases, such as chronic gastritis and gastroesophageal reflux disease. Patients with central nervous system diseases, such as traumatic brain injury and cerebrovascular disease, who suddenly develop jet vomiting need prompt medical attention.