Diabetes can cause brain infarction. Compared with ordinary patients, the risk of cerebral infarction in diabetic patients is significantly increased, especially in patients with diabetes combined with hypertension, the increased risk of cerebral infarction will be more significant, the causes of cerebral infarction caused by diabetes: 1, because of high blood sugar in diabetic patients, will lead to a significant increase in blood viscosity, blood in a state of hypercoagulation. 2, diabetes can cause multiple stenosis or vascular occlusion of the carotid arteries and intracranial arteries, which can also lead to cerebral infarction. It can also lead to the occurrence of cerebral infarction. The risk of cerebral infarction is significantly higher in diabetic patients under the effect of both factors, so diabetic patients are required to strengthen the control of blood sugar.