Severe headaches may signal an urgent problem. Call your doctor immediately or go to the emergency room if your headache:

1) Comes on suddenly and is the worst headache you’ve ever had. This could be a sign of aneurysm (weak blood vessels since birth)
2) Is accompanied by fever, stiff neck, lethargy, or uncomfortable vomiting. It might be a brain infection or meningitis.
3) Causes you to be confused or lose consciousness. It could be a concussion, encephalitis, or bleeding in the brain…or look for metabolic causes such as electrolyte imbalance.
4) Recurrent headaches that start small and steadily progress over several days with a marked periodicity of vomiting. This could be a brain tumour or brain disorder.

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