The process of vomiting regurgitation of vomitus can usually be divided into nausea, dry heaving and vomiting. 1. Nausea: Usually when the patient is nauseated, gastric tone and peristalsis will be weakened and duodenal tone will be increased, with or without duodenal reflux. 2. Dry heaving: Usually when the patient is dry heaving, the upper part of the stomach relaxes, leading to transient contraction of the sinuses. 3. Vomiting: Usually when the patient vomits, the gastric sinus will continue to contract and the cardia will open; at the same time, the abdominal muscles will contract and the abdominal pressure will increase, forcing the gastric contents to reflux from the stomach rapidly and to be discharged through the esophagus and the oral cavity. Patients who experience vomiting are advised to seek prompt medical attention and standardized treatment under the guidance of a doctor.