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Unlike a migraine, thunderclap headaches seem to come on suddenly. The pain grabs your attention in the same way a clap of thunder does. You can feel pain anywhere on your head or neck. You may even feel it in your back. You might also have several other symptoms, including: Changes in vision. Confusion. Nausea.
1 THUNDERCLAP HEADACHE, a sudden severe headache in the back of the head, reaching its peak in less than a minute. Causes include: 2  BRAIN ANEURYSM â a widening of one of the brain arteries.  Bleeding between the brain and membranes covering the brain (subarachnoid hemorrhage), usualy from a RUPTURED ANEURYSM.