Nausea and vomiting may be pregnancy reaction, motion sickness reaction and other physiological reasons, but also may be gastritis and other inflammatory stimulation, taking medication to stimulate the gastrointestinal tract, high blood pressure and other intracranial pressure increased out of the reasons. Early pregnancy hormonal changes in the body, will often nausea and vomiting, is a normal physiological phenomenon. Car, airplane, etc., some people vestibular function is more sensitive, may also appear nausea and vomiting and other motion sickness reaction, you can take motion sickness medicine to relieve. If you have gastritis, gastric ulcer and other digestive diseases, due to inflammation stimulation and other gastrointestinal smooth muscle contraction, gastric content reflux may appear nausea and vomiting. Taking antibiotics, antidepressants and other medications that stimulate the gastrointestinal tract may also cause adverse reactions such as nausea and vomiting. Hypertension, subarachnoid hemorrhage, etc. may also occur due to increased intracranial pressure affecting the central nervous system. The occurrence of nausea and vomiting excludes physiological causes such as early pregnancy, and may also be caused by other diseases.