The cause of tension headache is not exactly known. Experts used to think tension headaches stemmed from muscle contractions in the face, neck and scalp, perhaps as a result of heightened emotions, tension or stress. But research suggests muscle contractions aren't the cause.
The most common theories support a heightened sensitivity to pain in people who have tension headaches and possibly a heightened sensitivity to stress. Increased muscle tenderness, a common symptom of tension headache, may result from a sensitized pain system.
What Triggers the Headache?
Stress is the most commonly reported trigger for tension headaches.
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