Secondary prevention: 1. Pay attention to stroke precursors Some patients often have symptoms such as numbness, tingling, transient blackness, headache, dizziness, slurred speech, salivation at the corners of the mouth a few hours or days before stroke occurs. 2, hypertension and diabetes Diastolic blood pressure reduced by 5-6 mmHg can reduce the incidence of stroke by 42%, after systematic anti-hypertension treatment, all stroke patients reduced by 38%, severe stroke patients reduced by 34%. Diabetic patients have 1 times higher risk of stroke than their counterparts with normal blood glucose. Actively prevent and treat hypertension and diabetes, and insist on taking antihypertensive drugs and hypoglycemic drugs, related but long-term follow-up. 3, heart disease organic heart disease is prone to the formation of superfluous or thrombus, after shedding blocking the cerebral vessels, cerebral embolism occurs. 4, hyperlipidemia Elevated cholesterol and low-density lipoprotein concentration is one of the most risk factors for stroke. Lipid-lowering drugs can reduce the risk rate of stroke after myocardial infarction by 30%. 5, inflammation The most common ones are vasculitis caused by syphilis and vasculitis caused by herpes zoster infection. 6.Homocysteinemia is an independent risk factor for stroke, and it runs in families. 7. Other Patients with carotid artery stenosis or occlusion are at increased risk of stroke when there is hemodynamic impairment, such as profuse sweating, diarrhea, etc., which can easily trigger hypovolemia and thus lead to stroke.