Normally, hypertension does not lead to fever, but once a hypertensive patient develops fever, it is a sign of severe impairment of the corresponding target organ function or other comorbidities, such as infections. In severe hypertension, when the high pressure is >180mmHg and the low pressure is >120mmHg, the patient will have obvious hypertensive crisis, and even hypertensive encephalopathy causing increased intracranial pressure. At this time, patients will have dizziness, headache, nausea, jet-like vomiting vision, blurred vision, if once malignant hypertension led to acute cerebrovascular disease attack, especially in the presence of acute cerebral hemorrhage or acute cerebral embolism, there will be a central nervous system compression and cause central fever, which at this time belongs to the central nervous system temperature regulating point dysfunction, which is a clear central type of fever In this case, the fever is clearly of the central type, and the body temperature must be lowered by actively treating the primary disease.