Thunderclap headache
Severe and sudden-onset headache / From Wikipedia, the free encyclopedia
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A thunderclap headache is a headache that is severe and has a sudden onset. It is defined as a severe headache that takes seconds to minutes to reach maximum intensity.[1][2] Although approximately 75% are attributed to "primary" headaches—headache disorder, non-specific headache, idiopathic thunderclap headache, or uncertain headache disorder—the remainder are secondary to other causes, which can include some extremely dangerous acute conditions, as well as infections and other conditions.[3] Usually, further investigations are performed to identify the underlying cause.[1]