Tension headache refers to head pain associated with stress and muscle contraction. These headaches may occur only occasionally in response to a stressful event. They may also be chronic, occurring frequently. Some tension headaches are nearly constant, with daily pain that may vary in intensity.

Tension Headache: Areas of Pain
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Tension headaches may occur when muscles in the neck, face, and scalp contract, which produce pain. The precise cause of this muscle contraction is unknown. Factors that may contribute to tension headache include: