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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.
A subarachnoid hemorrhage (SAH), or subarachnoid haemorrhage in British English, is bleeding into the subarachnoid space âthe area between the arachnoid membrane and the pia mater surrounding the brain.This may occur spontaneously, usually from a ruptured cerebral aneurysm, or may result from head injury.igns and symptoms of SAH include a severe headache with a rapid onset ( thunderclap headache ), vomiting, confusion or a lowered level of consciousness, and sometimes seizures. In general, the diagnosis is confirmed with a CT scan of the head, or occasionally by lumbar puncture.