Before a subarachnoid hemorrhage, patients generally do not exhibit obvious symptoms. However, if a patient suddenly experiences severe headaches, nausea, vomiting, and other discomforts, subarachnoid hemorrhage should be suspected. The patient should promptly seek attention and complete a cranial CT scan. If the diagnosis of subarachnoid hemorrhage is confirmed, measures should be taken to dehydrate the patient and reduce intracranial pressure. If the patient has a significant amount of intracranial bleeding, surgical treatment should be considered to remove intracranial hematomas and other proactive managements, while dynamically observing changes in the patient's consciousness and pupils.