It is difficult to accurately determine the amount of subarachnoid hemorrhage, and medication and surgical treatment should be actively administered regardless of the amount of bleeding. When subarachnoid hemorrhage occurs, usually due to the rupture of an aneurysm or other aneurysms, the blood flow is distributed in the cerebral pools and ventricles of the brain, and cerebrospinal fluid is mixed with the blood, so it is difficult to determine the amount of bleeding, and it is mainly judged according to the areas of increased density on the CT scan of the skull. Subarachnoid hemorrhage requires active treatment, such as immediate bed rest; the use of tranexamic acid, aminocaproic acid and other hemostatic treatment; nimodipine and other prevention and treatment of cerebral vasospasm; mannitol, glycerol fructose and other to reduce cerebral edema to reduce intracranial pressure. Patients with surgical indications should follow the doctor’s instructions to clip the aneurysm or interventional embolization of the aneurysm. Subarachnoid hemorrhage can occur suddenly, severe headache, swelling pain or burst-like, often accompanied by nausea and vomiting, unconsciousness and other symptoms. Patients with these symptoms should go to the hospital immediately to avoid aggravation of the condition and life-threatening situation.