The causes of cerebral infarction can be broadly categorized into three groups: first, problems with blood vessel walls; second, problems with hemodynamics; and third, problems with blood components. Problems of the vessel wall include atherosclerosis, atherosclerosis caused by various types of hypertension, diabetes mellitus, hyperlipidemia, hyperuricemia, etc., which causes narrowing of the blood vessels and occlusion. Problems with hemodynamics are often due to cardiac insufficiency, or excessive loss of body fluids from various other causes, resulting in cerebral infarction caused by impaired perfusion pressure to the brain. Problems with blood components include various hematologic disorders, tumors, or quantitative and qualitative changes in blood components causing thrombosis, as well as cardiac factors such as atrial fibrillation, rheumatic valvular disease, and, of course, some unexplained diseases such as connective tissue disease and vasculitis, which can also cause cerebral infarction symptoms.