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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.
You should seek immediate medical attention if you have: 1  A sudden headache or if your headaches change in pattern, intensity or symptoms. 2  An abrupt, head pain like a thunderclap. 3  Headache that is accompanied by fever, stiff neck, rash, seizures, mental confusion, double vision, weakness, numbness or trouble speaking.