The onset of ischemic foci in the brain and cerebral infarction are both correlated with cerebral blood flow, and the consequences of their onset are severe. Cerebral ischemic foci can manifest as unilateral or bilateral limb numbness, decreased muscle tone, dizziness, slurred speech or aphasia, and the diagnosis is usually confirmed by MRI. Cerebral infarction can be detected as a lesion on CT or MRI, and the patient can also generally show symptoms of neurological deficits. For symptoms with ischemic foci in the brain, they can generally manifest as different symptoms depending on the anterior and posterior circulation, where the posterior circulation manifests as dizziness, visual rotation, nausea, vomiting, numbness and weakness of limbs or poor balance function of limbs, and the cerebellum will show gibberish-like language.