Risk factors for cerebrovascular disease are classified as intervenable or non-intervenable: age and gender are two non-intervenable risk factors. The risk of stroke continues to increase with age, with the risk of stroke increasing 1-fold every 10 years after age 55. In addition, the risk factors that cannot be intervened are race and family heredity, season and climate. Some of the major risk factors that can be intervened include hypertension, heart disease, diabetes, dyslipidemia, homocysteinemia, high platelet aggregation, and carotid stenosis. As well as lifestyle factors such as smoking, alcohol abuse, obesity, lack of reasonable exercise, high salt intake, oral contraceptives, dietary nutrient deficiencies, and substance abuse.