Sudden dizziness and vomiting in a person with persistent symptoms are considered to be caused by ischemia in the posterior circulation. Because of the slowed blood flow in the vertebral and basilar arteries bilaterally, the ischemia stimulates the vestibular nerve nucleus, resulting in dizziness and vomiting, and may be accompanied by sympathetic excitation, such as panic attacks and cold sweats. In such cases, it is important to consult a hospital for an intracranial vascular ultrasound and treatment. In addition, if the symptoms of dizziness and vomiting can be relieved in an instant, it should be considered as benign paroxysmal positional vertigo, and the tremor of the eyeballs can be observed. If a patient has a history of cold and flu and suddenly has dizziness and vomiting, it may be caused by vestibular neuronitis, which also needs to be treated systematically in a hospital.