1. Primary hypertension: It is the most common cause, mostly seen in the elderly, but can also develop in younger hypertensive patients. Basal ganglia hemorrhage is a common site of hemorrhage in hypertensive cerebral hemorrhage. 2, amyloid angiopathy: It is a common cause of sporadic cerebral hemorrhage in the elderly, and the incidence increases with age. The site of hemorrhage is usually confined to the lobes, cortex and subcortex. 3, vascular abnormalities: including aneurysms and vascular malformations, vascular abnormalities in lobar and ventricular hemorrhage are more common than other sites of cerebral hemorrhage. 4, anticoagulant or antiplatelet drugs: brain hemorrhage associated with them can occur in all parts of the brain, but more likely to occur in the cerebellar hemorrhage. 5, sympathomimetic drugs: brainstem hemorrhage is more frequent in the cocaine-associated brain hemorrhage group. 6, venous sinus thrombosis: less research at present. 7, tumor: bleeding due to tumor is related to the location of the tumor. 8, vasculitis: very rare.