Dizziness and vomiting after getting up may be caused by insufficient blood supply to the brain. The human body is generally in the horizontal position during sleep, and the horizontal position is conducive to the blood supply to the brain. If the position is changed from horizontal to upright, for example, a sudden transient hypoperfusion of the brain can occur after getting up, which can cause impaired blood supply to the brain and cause cerebral hypoperfusion, and patients can experience dizziness, nausea, vomiting, and also balance disorders and ataxia. If the patient has inadequate blood supply to the internal carotid artery system, he or she generally shows signs and symptoms of cerebral ischemia and hypoxia, and the patient may experience episodes of sensory and motor deficits in the lateral limbs, and may also develop hemianopia, and some patients may also develop vegetative dysfunction. In case of left-sided lesions, the patient may also develop speech dysfunction, and may experience transient blackouts in one eye, etc. If the patient frequently presents with slow movements when getting up, and actively seek the cause. If it occurs once in a while, care should be taken to prevent a fall when getting up.