Patients sometimes feel vertigo for 1-2 seconds, the cause of which has many aspects, to be analyzed in conjunction with the triggers of the onset of the patient, the underlying disease: 1. If the patient has vertigo for 1-2 seconds during a change in position, such as when it occurs during a specific head position, it is considered to be caused by benign paroxysmal positional vertigo. If the patient appears during squatting up, consider that it is caused by postural hypotension, which can be clarified by doing prone and standing blood pressure. If the difference between prone and upright blood pressure is more than 20mmHg, it is considered to be caused by postural hypotension.2. Many people have episodes of vertigo for 1-2 seconds when they have a bad night’s sleep and the brain is in a state of fatigue, which belongs to the manifestation of cerebral nerve dysfunction.