Although both brain stem hemorrhage and subarachnoid hemorrhage are intracranial hemorrhage, there are some differences between them in terms of etiology, location of hemorrhage, symptoms and treatment. 1. Causes: Brain stem hemorrhage is usually caused by the degeneration of blood vessels due to high blood pressure, while subarachnoid hemorrhage is caused by the rupture of blood vessels in the brain and the blood flowing into the subarachnoid space. 2. Location of hemorrhage: Brain stem hemorrhage is mostly in the bridge of the brain, while subarachnoid hemorrhage covers the whole surface of the brain. 3. Symptoms: Symptoms of brainstem hemorrhage are usually more serious, such as coma, vomiting, hemiparesis, etc. Subarachnoid hemorrhage often shows headache, nausea and vomiting, consciousness disorder, etc. 4. Treatment: The treatment of brainstem hemorrhage is mainly to reduce intracranial pressure, and the treatment of subarachnoid hemorrhage is mainly to prevent rebleeding and vasospasm. Both brain stem hemorrhage and subarachnoid hemorrhage will have great impact on health, so it is necessary to actively seek medical treatment to avoid delaying the best time for treatment.