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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.
Time is of the essence with this type of headache and a speedy diagnosis can spell the difference between life and death. A thunderclap headache is not a recurring type of headache, but that doesnât mean a person who has experienced this type of headache should take his or her time before seeing a headache specialist.