Sudden dizziness may be associated with a variety of causes such as hypoglycemia, cervical spondylosis, cerebrovascular disease, otolithiasis or Meniere’s disease. People who experience hypoglycemia will have dizziness, palpitations, hand tremors and even coma. In cervical spondylosis such as vertebral artery cervical spondylosis, patients will have vertigo attacks when their head rotates due to the narrowing of the vertebral artery vessels and insufficient blood supply to the brain, which can be relieved by themselves in mild cases. Cerebrovascular disease such as transient ischemic attack, there are blackouts, sudden vertigo and other manifestations. Patients with otolithiasis may experience sudden and intense rotational vertigo with a change in body position, which is of short duration and can be relieved on its own. Ménière’s disease presents with sudden episodes of vertigo, which is relieved when the eyes are closed. Sudden feeling of dizziness or vertigo, it is recommended to go to a hospital specialist, according to the characteristics of its attacks and related examinations, to clarify the cause of the disease and then targeted treatment.