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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.
Intracranial hemorrhage Subarachnoid hemorrhage (SAH) is the most common cause of a sudden intense and incapacitating headache (thunderclap headache or âworst headache of my lifeâ). The pain is usually unilateral and associated with nausea, vomiting, nuchal rigidity, and occasionally fever or cardiac dysrhythmia.