Suddenly appear upset, want to vomit causes are mainly seen in the following: 1, dietary factors, mainly eating raw, hard, too cold, greasy and eat too much, leading to the gastrointestinal tract to increase the burden of digestion, the stimulation of these foods will be upset, want to vomit. 2, acute gastroenteritis, mainly due to the intake of unclean food leads to a large number of bacteria into the gastrointestinal tract, these bacteria in the gastrointestinal tract to multiply and produce toxins, resulting in damage to the gastric mucosa. These bacteria multiply and produce toxins in the gastrointestinal tract, leading to damage of the gastric mucosa. Therefore, the gastric mucosa in these irritating factors will appear gastrointestinal poisoning symptoms, then appear upset, want to vomit feeling. 3, central nervous system diseases, such as elevated blood pressure, intracranial hemorrhage, and other acute intracranial lesions lead to increased intracranial pressure, which can lead to a sudden headache, upset, and want to vomit feeling. 4, auricular diseases, such as Meniere’s syndrome, due to the balance system of the inner ear pathology caused by vertigo, at the same time, can be accompanied by symptoms of upset, want to vomit. 5, the ear source of disease, such as Meniere syndrome, due to balance system of the inner ear pathology led to vertigo, while can be accompanied by symptoms of heartburn and vomiting.