Stroke is a disease caused by sudden rupture and bleeding of blood vessels in the brain or by blockage of blood vessels causing ischemia and hypoxia in the brain. There are two clinical categories: hemorrhagic and ischemic. Hemorrhagic stroke includes clinically diagnosed cerebral hemorrhage and subarachnoid hemorrhage; ischemic stroke has more common diagnostic terms, including cerebral infarction (or cerebral death), cerebral thrombosis, cerebral infarction, etc. The term “primary prevention” refers to the prevention of stroke before the onset of the disease, i.e., the prevention of cerebrovascular disease (or delaying the onset of the disease) by changing unhealthy lifestyles at an early stage and proactively controlling various fatal risk factors. The aim is to prevent (or delay the onset of) cerebrovascular disease by making early changes to unhealthy lifestyles and proactively controlling various risk factors. The prevention of stroke should be based on the “four cornerstones of health” and the change of unhealthy lifestyles, and the following points should be done in daily life: 1. Increase physical activity8. Eat lightly9. Pay attention to climate change10. Secondary prevention is for patients who already have stroke symptoms or who have already had a stroke and need to prevent another stroke. In this case, in addition to continuing to control risk factors, it is also necessary to prevent recurrence depending on the cause of the stroke. In the case of hemorrhagic stroke, blood pressure control should be the main focus. For ischemic stroke, anti-platelet or anti-coagulant medication should be given for prevention. Remember: 1. In any case, control of controllable risk factors is very important, including blood pressure level, blood cholesterol level, smoking, diabetes, obesity, etc. 2. The above risk factors can be controlled by lifestyle of the disease (proper diet, increase moderate exercise, reduce salt intake, stop smoking). 3. If lifestyle changes are not effective, medication must be used. 4. Current clinical drug therapy includes: anti-hypertensive drugs for hypertensive patients, statins or betablockers for hypercholesterolemic yellow true; anti-platelet has been shown to prevent recurrence of stroke.