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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.
Case Report. 1  A thunderclap headache is a severe headache with sudden onset similar to a clap of thunder, with a maximum intensity within 1 minute. 2  Although Day and Raskin[1] initially coined the term thunderclap headache to refer to the headache associated with an unruptured aneurysm, the most common secondary cause is subarachnoid hemorrhage.