The main differences between subarachnoid hemorrhage and cerebral hemorrhage are as follows: First, the most common cause of subarachnoid hemorrhage is ruptured intracranial aneurysm, and some patients have arteriovenous malformations. The most common causes of cerebral hemorrhage, such as cerebral atherosclerosis caused by hypertension, diabetes or traumatic cerebral hemorrhage after the patient has a history of trauma, and other patients with hematologic disorders and abnormal coagulation function. Second, the main symptoms of subarachnoid hemorrhage and cerebral hemorrhage, subarachnoid hemorrhage patients will have a very severe headache, which can be accompanied by significant nausea and vomiting. Patients with cerebral hemorrhage will also have headaches, but they are not as severe as subarachnoid hemorrhage. Patients with cerebral hemorrhage will have hemiparesis of the limb contralateral to the hemorrhagic focus, while patients with subarachnoid hemorrhage will have symmetrical limb strength. Patients with subarachnoid hemorrhage are prone to cerebral vasospasm, which is generally rare in parenchymal hemorrhage, except in ventricular hemorrhage where cerebral vasospasm may occur, and the risk of rebleeding is higher in subarachnoid hemorrhage than in parenchymal hemorrhage. Subarachnoid hemorrhage is mainly manifested as high-density foci on the brain surface and subarachnoid space, while brain hemorrhage is mainly manifested as high-density foci in the brain parenchyma or brain lobes. Subarachnoid hemorrhage should be treated differently due to different etiologies. If conditions allow, cerebral angiography should be performed as soon as possible to clarify the intracranial aneurysm, while cerebral parenchymal hemorrhage can be treated surgically or conservatively.