Differential diagnosis of cerebrovascular accident mainly includes cerebral infarction, cerebral hemorrhage and subarachnoid hemorrhage. 1. Cerebral infarction: it refers to a kind of clinical syndrome in which various cerebrovascular lesions cause blood supply obstacles in the brain, leading to ischemia and hypoxic necrosis of local brain tissues and rapid appearance of corresponding neurological deficits. The onset of the disease often occurs during quiet or sleep, and the focal signs reach the peak more than 10 hours or 1~2 days after the onset of the disease. 2. Cerebral hemorrhage: the onset of the disease is sudden, often without aura. Common triggering factors include mood swings, physical labor, drinking after meals, sex, straining to defecate and climate change. Patients often have a sudden headache, head swelling, followed by vomiting, and may soon develop consciousness and neurological dysfunction, which is progressively aggravated. 3. Subarachnoid hemorrhage: The clinical manifestations vary greatly, with mild cases having no obvious clinical symptoms and signs, and severe cases having sudden coma or even death. The disease occurs mostly in young and middle-aged people, with sudden onset (within seconds or minutes), and most of the patients have obvious triggers before the onset of the disease (strenuous exercise, excessive fatigue, straining to defecate, emotional excitement, etc.). When this disease occurs, it is recommended that patients should go to the hospital in time, under the guidance of the doctor to improve the auxiliary examination to clarify the diagnosis and active treatment, so as to avoid delaying the condition.