The specificity of stroke in young people: The etiology is complex and varied, with more than 100 potential causes, and can be roughly divided into two major groups. The first major category: common in the elderly population, traditional risk factors are commonly advanced in the young population. Such as atherosclerosis, hypertension, diabetes, heart disease, smoking, alcohol, obesity, and reduced activity, which account for about 20% of the causes of stroke in young people and are listed first. The second major category: rare, mainly occurring in the young population causes, can be subdivided into the following categories: 1, cerebrovascular malformations / congenital developmental abnormalities; 2, infections; 3, autoimmune reactions; 4, rare cardiogenic emboli; 5, hypercoagulability / appearance of abnormal components; 6, genetic mutations; 7, vascular injury; 8, other.