Getting up too hard and experiencing dizziness and nausea may be caused by insufficient blood supply to the cerebellar brainstem, resulting in ischemia and hypoxia of the cerebellar brainstem. Most of them are due to low blood pressure, causing low perfusion in the brain, mostly seen in patients with postural hypotension. It is also prone to occur if the patient is usually weak. Postural hypotension is a kind of systemic autonomic dysfunction disease, usually the patient’s blood pressure is low in lying position, and high in sitting position or upright position. If the movement is too violent when getting up, it may cause a transient drop in blood pressure, which is easy to cause cerebral hypoperfusion, and it may lead to cerebral blood supply insufficiency. When the blood supply to the cerebellar brainstem is insufficient, the patient’s main manifestations are dizziness, nausea, balance disorder and ataxia. If the blood supply to the brain is insufficient, there can be blackness before the eyes, and there may also be limb sensory deficits and motor dysfunction. Therefore, for patients with postural hypotension, it is important to move slowly when getting up.