Both high blood pressure and low blood pressure can cause patients to experience dizziness. For patients with high blood pressure, once dizziness and headache accompanied by blurred vision, blurred vision, vision loss, nausea, and vomiting occur, it is important to consider hypertensive encephalopathy occurring at high pressure >180 mm Hg or low pressure >120 mm Hg or more, and the patient will have obvious dizziness accompanied by the clinical manifestation of headache because the patient has experienced Relative target organ function is impaired, for example, brain cell function is impaired. Low blood pressure can also induce dizziness, once the high pressure is lower than 90mmHg or the low pressure is lower than 50mmHg, there will be insufficient blood supply to the corresponding organs, especially the cerebrovascular blood supply is insufficient as the main clinical symptom, and the patient will have dizziness, blurring of vision, blurring of sight, transient darkness in front of the eyes, or even sudden collapse of the clinical symptom and performance.