The back of the head and neck may be gripped in a viselike pain. Cluster headaches can crop up with changes in the weather or from alcohol and other foods. They appear as a sharp pain in or near one eye. While occasional headaches are a normal part of life, some signal a serious problem. Severe headaches with a stiff neck and fever, or double vision, could warn of infection, bleeding in the brain, a tumor or a blood clot.
Any unusual headache calls for a visit to a doctor.
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