1, the danger of stroke Stroke is a serious threat to human health, its morbidity and mortality has jumped to the top three of the disease spectrum. Stroke is characterized by high morbidity, high mortality, high disability and high cost. According to the World Health Organization, the incidence of stroke in China will continue to rise as the population ages and the average life expectancy of the population increases. Stroke often lacks obvious clinical symptoms before the onset of stroke, once the onset of stroke, severe hemiplegia or death, about 75% of survivors are left with varying degrees of disability, and more than 1/4 of stroke patients will have another stroke within 1 to 5 years after the onset of stroke, and the cost of hospitalization for each acute attack is as high as 10,000 yuan. 2.What factors are likely to cause stroke? Factors associated with the occurrence of stroke are commonly referred to as risk factors. Long-term, in-depth studies of risk factors for stroke have been conducted at home and abroad, and the risk factors for stroke have been grouped into the following three categories: Category 1: Factors that cannot be changed, these factors include age, gender, race or ethnicity, and family genetic history. The likelihood of stroke onset increases with age, is higher in men than in women, is higher in blacks than in whites, and increases in the likelihood of stroke in family members with blood relatives who have had strokes. Category 2: Modifiable factors, these include hypertension, diabetes, heart disease, hyperlipidemia, smoking and asymptomatic carotid stenosis, of which hypertension is considered the primary risk factor for stroke. The above factors can increase the likelihood of stroke onset, but after control or reasonable treatment, the likelihood of onset will be reduced to varying degrees. The third category: factors that are expected to change, these factors include obesity, low physical activity, high-fat diet, alcohol abuse, and hypercoagulable state of blood. These factors have promise for reducing the likelihood of stroke onset with control or treatment, but current studies lack conclusive evidence. People with one or more of these risk factors are commonly referred to as susceptible. Recent domestic studies have found that hemodynamic testing in the above susceptible groups showed that about 30-35% of cerebrovascular hemodynamic indicators were significantly abnormal, as evidenced by cerebrovascular function scores below 75. These individuals have an increased risk of stroke, and they are a high-risk group for stroke. 3. Why does a stroke occur? The vast majority of stroke events occur on the basis of cerebrovascular atherosclerosis. With age and the combination of stroke susceptibility factors such as hypertension, diabetes, heart disease, hyperlipidemia, obesity, carotid artery stenosis, smoking and family genetics, it leads to atherosclerosis of the cerebral blood vessels. Those with milder lesions and slower progression will not experience significant cerebral blood supply deficiency and are less likely to have a stroke; those with more severe lesions will experience significant narrowing of the cerebral vessels or the formation of small aneurysms, which, when stimulated by external environmental factors, will form thrombi in the cerebral arteries and cause cerebral infarction (ischemic stroke); or cerebral artery rupture, resulting in cerebral hemorrhage (hemorrhagic stroke). In addition, it can also cause subarachnoid hemorrhage due to rupture of blood vessels caused by congenital aneurysm or malformation of cerebral vessels, or cerebral embolism due to dislodgment of blood clots in the heart or arteries. 4, the population of stroke elderly people is a high incidence of stroke, the risk of men is slightly higher than that of women. Population surveillance data show that 64% of cases occur in the age group of 55 to 75 years old, with the highest proportion of 34.6% in the age group of 55 to 65 years old and 4.4% in the age group of 45 years old or younger. Surveillance data in recent years show that there is a trend of younger onset of stroke. Therefore, people over 55 years of age should be the focus of prevention, but those over 40 years of age should also be strengthened.