Subarachnoid hemorrhage is a rather dangerous disease, generally caused by the rupture of an aneurysm, but it can also be due to cerebral arteriovenous malformations. The symptoms of the hemorrhage mainly manifest as severe headache, with many patients describing it as the worst headache of their life. Additionally, patients may experience significant nausea and vomiting, and signs of meningeal irritation such as neck stiffness. Patients with subarachnoid hemorrhage may also develop a fever, though typically not exceeding 38 degrees Celsius, and may experience cerebral vasospasms. If the spasms are severe, they could lead to secondary cerebral thrombosis. Moreover, if the bleeding is substantial, the patient may also suffer from consciousness disorders such as coma, as well as serious complications like electrolyte imbalances and hyponatremia.