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Unlike a migraine, thunderclap headaches seem to come on suddenly. The pain grabs your attention in the same way a clap of thunder does. You can feel pain anywhere on your head or neck. You may even feel it in your back. You might also have several other symptoms, including: Changes in vision. Confusion. Nausea.
A thunderclap headache could also be caused by any of the following: 1  Small tears in the arteries of your head or neck. 2  A burst artery or aneurysm, which is a swollen, weak area in the artery. 3  Blocked veins in your head.  Leaking spinal 1  fluid. Rapid changes in blood pressure.  An infection in your brain.