The four major complications of cerebral infarction are: I. Pulmonary infection. Patients who are bedridden for a long time may develop crushing pneumonia, or aspiration pneumonia due to choking and coughing with food mistakenly entering the trachea. ii. Decubitus ulcers. In severe cerebral infarction with poor treatment, patients have difficulty turning over and moving around, causing ulceration of the skin in contact with the mattress surface, and even secondary systemic infection. Third, lower limb venous thrombosis. Because of the reduced activity, it is easy to form thrombosis in the deep veins of the lower limbs, and once dislodged, pulmonary embolism or even death will occur. IV. Upper gastrointestinal bleeding, which is caused by stress ulcers, is directly related to intracranial lesions.