Cerebral hemorrhagic insufficiency can be determined by the clinical symptoms of the patient and the positive signs on examination. Generally, patients with cerebral hemorrhagic insufficiency will have dizziness, and in severe cases, it will be accompanied by episodes of visual rotation, nausea, vomiting, and at the same time, horizontal nystagmus can be found on physical examination, and vertical nystagmus can be found in patients with cerebral hemorrhagic insufficiency in the brainstem. If the blood supply to the brainstem is insufficient, the patient may also have vertical nystagmus. If the narrowing of blood vessels in some brainstem patients is more obvious, the patient may also have episodes of numbness and weakness of the limbs. Cerebral blood supply insufficiency can also be determined by auxiliary examination, commonly used in the clinic is the intracranial segment of the transcranial Doppler or magnetic resonance angiography MRA, as well as cervical vascular ultrasound, which will find that the vascular pulsatility index decreases, the blood flow rate slows down, and in severe cases, there will be blood theft, such as blood theft from the subclavian artery. In this case, the patient can be given medications to protect the endothelium, and symptomatic treatment such as stenting or endothelial stripping can be chosen if necessary.