The symptoms of nausea and vomiting with constant salivation are considered to be caused by stomach disorders. Many types of stomach diseases can cause nausea, vomiting, and increased salivation, such as chronic gastritis, bile reflux gastritis, and gastric polyps. Because of the pathological changes in the stomach, the gastric glands in the stomach will have enhanced secretion of gastric acid, and the gastric mucosa will be stimulated by gastric acid, which will cause reflex nausea and vomiting. Some patients with gastric diseases will have acid reflux, which is an acidic substance. When the mucous membrane of the upper respiratory tract, such as the throat and mouth, is stimulated by acidic substances, there will be an increase in mucus secretion and other physiological phenomena to reduce the stimulation of mucous membrane tissue by gastric acid. It is recommended to go to a regular hospital for further examination, such as gastroscopy, ultrasound imaging, pathological examination, etc. to confirm the diagnosis of the specific cause.