The danger period for large cerebral infarction is generally the first two weeks or so after the onset of the disease, so more than 6 days, during which time the patient’s vital signs should be closely monitored. Cerebral infarction can be caused by atherosclerosis of large arteries, cardiogenic embolism, etc. Due to the obstruction of blood flow and the interruption of blood supply, the brain tissues in the corresponding blood-supplying areas become ischemic and hypoxic, which leads to softening and necrosis, and a series of clinical symptoms, such as hemiparesis, appear. Large cerebral infarction is mostly due to the interruption of blood flow in large blood vessels, which can lead to life-threatening necrosis of brain nerve cells that govern respiration, heartbeat and other functions. About two weeks after the onset of the disease is generally more dangerous, and the condition is prone to fluctuation, and complications such as cerebral edema, increased intracranial pressure, post-infarction hemorrhage, infection, and upper gastrointestinal hemorrhage may occur, which can be life-threatening if not diagnosed and treated in a timely manner. If there are symptoms of suspected stroke such as limb immobility and abnormal sensation, timely diagnosis and treatment should be made to avoid delaying the condition.