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what causes headache on one side in back of head?

Most probably it’s a tension headache. It is the most common type of headache which causes a constant ache and tightness around head and behind the eyes, and neck. Tension headache usually last for a few hours and are commonly due to stress, fatigue or poor posture, which may cause tension in the neck and scalp.

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http://homeremediesforyou.com/Headache