The symptoms of dizziness and nausea are mainly due to the following reasons: 1. Cerebrovascular diseases, especially ischemic cerebrovascular diseases, such as cerebral infarction and insufficient blood supply to the vertebral basilar artery, can cause dizziness and lightheadedness due to cerebral ischemia, and in severe cases, there is an increase in intracranial pressure, which can lead to nausea and vomiting. 2. 3. Vestibular nerve diseases can also lead to dizziness, dizziness, nausea, etc. The more common diseases are vestibular neuronitis, benign positional vertigo, otoliths, Meniere’s syndrome, etc. 4.