Diabetes is very likely to cause stroke, especially in patients with poorly controlled blood glucose levels and a long history of diabetes, who are at higher risk of stroke, because the high blood glucose levels in patients lead to high blood viscosity, which can easily lead to thrombosis. If a patient has a long history of diabetes, it can cause multiple stenosis or even occlusion of the carotid arteries and intracranial arteries, which can also lead to cerebral ischemia, and the combined effect of these two factors can easily lead to a stroke. If the patient is also combined with hypertension, the risk of stroke will be even higher. Therefore, diabetic patients must control their blood sugar and need to take long-term oral aspirin as well as statin-based lipid-lowering drugs.