Diagnosis: 1. Sudden onset during physical activity or emotional excitement; 2. Recurrent vomiting, headache and elevated blood pressure are often present during the attack; 3. Differential diagnosis: 1. When CT examination is not available, it should be differentiated from cerebral infarction; 2. For those with sudden onset, rapid coma and inconspicuous focal signs, attention should be paid to differentiate from systemic poisoning (alcohol, drugs, carbon monoxide) and metabolic diseases (diabetes mellitus, hypoglycemia, hepatic coma, uremia) that cause coma; medical history and relevant laboratory tests can provide diagnostic clues, and there are no hemorrhagic changes on cranial CT. 3, traumatic intracranial hematoma mostly has a history of trauma, and the hematoma can be detected by cranial CT; 4, the hemorrhage is located in the shell nucleus, pallidum, thalamus, internal capsule, deep white matter around the ventricle, cerebral bridge, cerebellum, if there is a history of hypertension before the disease, basically can be diagnosed as hypertensive cerebral hemorrhage; elderly lobar hemorrhage without hypertension and other causes, mostly due to amyloid cerebral vasculopathy; hematological disease and anticoagulation, thrombolytic therapy caused by Hemorrhage caused by hematologic diseases and anticoagulation and thrombolytic therapy often have corresponding medical history or treatment history; tumor, aneurysm, arteriovenous malformation, etc., often have corresponding findings on cranial CT, MRI, MRA and DSA examination, and tumor stroke often shows acute exacerbation in the course of chronic disease.