Spontaneous subarachnoid hemorrhage is a non-trauma-induced subarachnoid hemorrhage. In clinical practice, I have encountered some primary care hospitals that do not know enough about spontaneous subarachnoid hemorrhage and only treat the hemorrhage without looking deeply into the cause of the hemorrhage, and then fail to treat the cause, and the patient can die from the second or third hemorrhage. About 70% of spontaneous subarachnoid hemorrhages are caused by aneurysms, and aneurysm rupture can be life-threatening, so patients with spontaneous subarachnoid hemorrhage should be treated with the utmost care. Patients with spontaneous subarachnoid hemorrhage usually present with severe headache, coma, and cervical tonicity, and CT suggests subarachnoid hemorrhage. Once the diagnosis of subarachnoid hemorrhage is established, angiography should be performed as soon as possible to find out whether there is an aneurysm.