This is a multi-center, prospective,continuous registry study. The investigators will include
3000 young adult (18-45 years old) patients with confirmed first-ever acute ischemic stroke
in China. The main purpose of this study is to build the study cohort of young ischemic
stroke patients in China, and to compare the prognosis and stroke recurrence of young
patients with different ischemic stroke subtypes. Secondary objectives are trying to find
biomarkers of stroke recurrence.