Whether subarachnoid hemorrhage requires surgery depends on the specific circumstances, as there are many causes of subarachnoid hemorrhage, commonly caused by aneurysms. Therefore, the decision to perform surgery is based on the size of the aneurysm and the amount of bleeding, as well as the patient’s overall condition to determine if they can tolerate surgery. Additionally, some subarachnoid hemorrhages may be caused by arteriovenous malformations or other reasons. The decision whether to opt for surgery or conservative treatment also depends on the amount of bleeding and the patient's symptoms, and the risk involved is relatively high.