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By Mayo Clinic staffThe exact cause or causes of tension headache are unknown. Experts used to think that the pain of tension headache stemmed from muscle contraction in the face, neck and scalp, perhaps as a result of heightened emotions, tension or stress. But research suggests that there doesn't appear to be a significant increase in muscle tension in people diagnosed with tension headache.
Changes in brain chemicals
Researchers now suspect that tension headache may result from changes among certain brain chemicals — serotonin, endorphins and numerous other chemicals — that help nerves communicate. Although it's not clear why the chemical levels fluctuate, the process is thought to activate pain pathways to the brain and to interfere with the brain's ability to suppress the pain.
Triggers
It's likely other factors also contribute to the development of tension headaches. Potential triggers may include:
- Stress
- Depression and anxiety
- Poor posture
- Working in awkward positions or holding one position for a long time
- Jaw clenching