Subarachnoid hemorrhage is a life-threatening condition. It refers to extravasation of blood into the subarachnoid space between the pial and arachnoid membranes. It is the third most common subtype of stroke. Approximately a quarter of patients with SAH die before hospital admission. It usually results from rupture of an intracranial aneurysm or by head trauma. The most common symptom is a sudden onset explosive headache, which patients often describe as the worst headache of their life. Patients can also present with transient or prolonged unconsciousness, focal neurological deficits including cranial nerve palsies and paresis, nausea and vomiting. By clinical exam, meningismus can be usually found. Diagnosis is made by a CT scan of the head or by lumbar puncture. Treatment options include endovascular coiling or neurosurgical clipping. Surgical clipping is a way to treat an aneurysm by placing a small metal clip across the neck of the aneurysm which excludes it from the circulation. With endovascular coiling, the interventionalist feeds a soft, flexible wire into the aneurysm via a catheter. The wire coils inside the aneurysm and seals off the aneurysm from the artery. Clipping is associated with a higher rate of occlusion of the aneurysm and lower rates of residual and recurrent aneurysms, whereas coiling is associated with lower morbidity and mortality and a better postoperative course. Secondary complications include: rebleeding, vasospasm, delayed cerebral ischemia, seizures, hydrocephalus and increased intracranial pressure. Systemic complications such as cardiac and pulmonary issues, electrolyte abnormalities and thromboembolism frequently happen and may have an impact upon prognosis.