Sudden dizziness and vomiting can be caused by the following reasons: 1) cerebrovascular diseases, such as ischemic cerebrovascular diseases, such as posterior circulation ischemia, dizziness, nausea, vomiting due to brainstem or cerebellar ischemia, and also accompanied by visual rotation, walking obliquity, etc. General treatment can be given to patients to improve circulation, anti-platelet aggregation and other treatments; 2) sudden dizziness and vomiting can also be seen in peripheral vertigo. It is caused by edema of vestibular labyrinth, and the patient can feel dizziness and vomiting with stuffy and swollen ears at the same time. Dizziness and vomiting can also be associated with neurological deficits and can be diagnosed by CT head examination. 4. dizziness and vomiting can also be seen in otoliths, which is also known as benign positional vertigo.