Momentary vertigo is a very common clinical symptom, many people will have this experience, the patient vertigo occurs a few seconds and can be completely back to normal, the reason is mainly considered to be the following aspects: first, is postural hypotension, causing a transient under-perfusion of the brain, this situation is mostly related to the patient’s position change, when the patient’s position change systolic pressure, diastolic pressure more than 20mmHg will cause . Secondly, instant vertigo should be considered to be caused by insufficient blood supply to the brain, and this type of patients mostly have risk factors such as cerebral vascular stenosis and cerebral arteriosclerosis. Thirdly, instant vertigo should be considered as a functional disease of the precursors, the most common ones in clinical practice are vestibular paroxysms and benign paroxysmal positional vertigo.