Ischemic foci in the brain refer to small infarct foci formed when the capillaries in the patient’s brain become ischemic and occluded, causing local brain tissue to become ischemic, hypoxic, and degenerative. Such foci are very small and will not show up on head CT. Many patients are found to have multiple ischemic foci formed in the brain when they have a head MRI. This condition indicates that the patient has atherosclerosis of the cerebral arteries, especially the small capillary arteriosclerosis is more obvious. The causes of formation are mainly related to vascular atherosclerosis caused by hypertension, diabetes, and hyperlipidemia, and patients need to take active and effective prevention from the above risk factors. If the patient’s condition progresses and worsens easily leads to lacunar cerebral infarction, which causes the patient to have symptoms of acute neurological deficits. Repeated occurrence of lacunar cerebral infarction may easily lead to the patient’s bilateral cortical brainstem bundles being affected, and the patient may experience symptoms of pseudobulbar palsy such as strong crying, strong laughing, vascular dementia, choking on water, and difficulty in swallowing.