High blood pressure will lead to patients with mosquito flying syndrome, mosquito flying syndrome refers to a small floating black shadow in front of the eyes, in the form of dots, flakes, strips of floating objects, like the fly’s shadow, in the white bright background appears more obvious, sometimes accompanied by a sense of flash, so called mosquito flying syndrome. Causes of mosquito flying, in the pathological case of sudden retinopathy, sudden intracranial pressure increase, caused by the above-mentioned conditions, diabetes caused by retinopathy will also have this performance. For sudden intracranial pressure increase, the most common factor is hypertension, patients in high pressure higher than 180mmHg, low pressure more than 120mmHg, easy to lead to acute hypertension, hypertensive crisis when prone to hypertensive encephalopathy, will appear intracranial pressure increase, so patients will be part of the symptoms of mosquito flying.