Do you have any cause of headache in mind?
Or, can you narrow down the type of headache:
- sudden, unexpected headache without the history of this type of headache, developed in minutes due to stroke or ruptured brain aneurysm
- rapidly developing (minutes/hours) headache following a head injury or poisoning with carbon monoxide, or infection, like meningitis or encephalitis, or metabolic problem, like liver failure (in cirrhosis) or kidney failure
- slowly developing (weeks/months) headache caused by a brain tumor
- recurring attacks several times a month in cluster headache
The order of investigations greatly depends on the suspected causes.
Here are main
causes and a quick description of sudden severe headaches.