Sudden vertigo may be related to otolithiasis, or it may be caused by vertebral artery-type cervical spondylosis, transient ischemic attack, and so on. 1. Otolithiasis: Usually due to a sudden change in head position, resulting in otoliths dislodging into the semicircular canals, sudden vertigo can be caused, which may also be accompanied by symptoms such as rotating vision and nystagmus. 2. Vertebral artery-type cervical spondylosis: vertebral artery-type cervical spondylosis is mainly due to cervical spine degeneration leading to vertebral artery compression, resulting in insufficient blood supply to the brain, and dizziness can occur when the patient suddenly rotates his/her neck. 3. Transient ischemic attack: usually due to atherosclerosis, hypertension, hyperlipidemia and other factors, resulting in transient insufficient blood supply to the brain, inducing transient neurological dysfunction, which may cause sudden vertigo, accompanied by sudden vision loss, sudden numbness of one side of the limbs, weakness and other symptoms. Sudden dizziness may also be caused by other reasons. If the symptoms recur frequently, you should consult a doctor as soon as possible to confirm the cause of the disease and have the treatment guided by the doctor.