Subarachnoid hemorrhage is a rather dangerous disease that develops very suddenly, most often caused by the rupture of an intracranial aneurysm. Some patients may not have any sequelae, but some severe cases can result in lasting consequences. Common sequelae include the following aspects: First, hydrocephalus. This condition can lead to adhesions of the meninges and can cause blood to remain in the subarachnoid space and the ventricles, potentially causing fluid accumulation. Second, there may be residual epileptic seizures. If epilepsy is a sequela, long-term oral anti-epileptic drugs are required. Third, some patients may experience cerebral vasospasm, leading to secondary cerebral infarction, which can leave patients with limb paresis and language impairments.