Sudden vertigo can be caused by brain disorders, vertebral artery cervical spondylosis, Meniere’s disease, and otolithiasis. 1. Brain diseases: Brain hemorrhage, cerebral infarction, etc. can cause vertigo, and brain tests such as CT and MRI are needed to identify the disease. 2. Vertebral artery cervical spondylosis: Patients may experience episodes of vertigo, migraine, tinnitus, nausea and vomiting, and may also experience corresponding nerve root irritation and sympathetic symptoms. 3. Ménière’s disease: patients may manifest symptoms such as vertigo, hearing loss, tinnitus and ear stuffiness, nausea and vomiting, as well as a drop in blood pressure. 4. Otolithiasis: The patient manifests a strong sense of vertigo, which usually lasts for about a minute and can be relieved on its own, accompanied by nausea and vomiting and other symptoms of autonomic disorders. Frequent and sudden dizziness is recommended to consult a doctor in time, by a professional doctor for examination, to clarify the cause of the disease, and reasonable treatment.