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By Mayo Clinic Staff. Thunderclap headaches live up to their name, grabbing your attention like a clap of thunder. The pain of these sudden, severe headaches peaks within 60 seconds and can start fading after an hour. Some thunderclap headaches, however, can last for more than a week. Thunderclap headaches are often a warning sign of potentially life-threatening conditions, usually linked to bleeding in and around the brain. That's why it's so important to seek emergency medical attention if you experience a thunderclap headache.
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.