Stroke is caused by blockage or rupture of some cerebral blood vessels. Stroke caused by blockage of cerebral blood vessels is ischemic stroke, and stroke caused by rupture of cerebral blood vessels is hemorrhagic stroke. Risk factors causing stroke include two categories: uncontrollable factors and controllable factors, controllable factors such as: advanced age, genetics, etc., controllable factors such as: hypertension, hyperlipidemia, diabetes, smoking, alcohol consumption, heart disease, arrhythmia, obesity, oral contraceptives, excessive physical activity and lack of physical exercise, dietary factors such as high salt, meat, high animal oil diet, etc. Therefore, active intervention of controllable risk factors, maintaining a healthy lifestyle, and active control of body indicators can greatly reduce the risk of stroke. The main signs of stroke are: facial asymmetry, weakness in one limb, numbness or abnormal sensation in one limb, and slurred speech. To quickly identify a stroke, do this: smile, raise your hand, and talk. Smile to see if one side of the face is drooping; lift your arm to compare if one side of the arm is drooping; speak to see if your speech is slurred or abnormal. If you observe any of these symptoms, call 120 immediately and ask for medical help, never wait until the signs become more obvious. Early and accurate diagnosis of stroke helps to intervene early, thereby improving the functional status and quality of life of survivors and reducing the risk of recurrence of early stroke. Early recognition is particularly important in ischemic stroke because dissolving clots is effective only in the first few hours after stroke onset; once this window is missed, thrombolytic drugs are not only ineffective but even harmful. This is when time is brain and time is quality of life, so it is important to seek early medical attention and to accurately document the time of stroke onset.