There are many reasons for sudden dizziness: 1, caused by vertigo, vertigo is a common clinical disease, often caused by cerebral ischemia, cervical spondylosis and Meniere’s syndrome, etc. Once vertigo occurs, you should go to the hospital for symptomatic treatment in time, vertigo has no obvious positive signs during clinical examination, combined with clinical symptoms can be diagnosed. 2, the cause of sudden vertigo, it may also be The sudden appearance of dizziness may also be caused by cerebrovascular accidents, such as cerebral infarction, cerebral hemorrhage and other diseases, which may lead to dizziness in the early stage, and should be diagnosed through blood pressure measurement and related examination. You should go to the hospital for cranial CT or nuclear magnetic examination to make a clear diagnosis.