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Results 1 - 2 of 2 for Thunderclap headache
  1. Subarachnoid hemorrhage 
    ... a severe headache that starts suddenly (often called thunderclap headache). It is often worse near the back of the head. Many people often describe it as the "worst headache ever" and ...
    https://medlineplus.gov/ency/article/000701.htm - Medical Encyclopedia
  2. Aneurysm in the brain 
    ... of my life." It may be called a thunderclap or sentinel headache. This means the headache could be a warning ...
    https://medlineplus.gov/ency/article/001414.htm - Medical Encyclopedia