Which condition is characterized by a sudden thunderclap headache and rapid deterioration, often with a history of hypertension?

• A. Ischemic Stroke
• B. Subarachnoid Hemorrhage
• C. Intracerebral Hemorrhage
• D. Migraine

Answer: (B)

A sudden, thunderclap headache with rapid deterioration points to bleeding into the subarachnoid space, most often from rupture of a cerebral aneurysm. That abrupt, peak-in-seconds-to-minutes pain is the hallmark of subarachnoid hemorrhage, and the blood in the subarachnoid space irritates the meninges, which can quickly lead to decreased consciousness and other rapid changes in mental status. Hypertension is a known risk factor because it weakens vessel walls and increases the chance an aneurysm will rupture.

This presentation helps distinguish it from other conditions. An ischemic stroke usually starts with new focal neurological deficits—like one-sided weakness or trouble speaking—that develop over minutes to hours, not with an explosive headache. An intracerebral hemorrhage can also cause a sudden severe headache, but it more commonly presents with focal deficits and signs of raised pressure rather than the quintessential thunderclap headache. A migraine may be intense and painful, but it typically includes throbbing pain with photophobia, nausea, and a more gradual onset, and it doesn’t usually involve rapid deterioration or signs of hemorrhagic bleed.