It starts in the back of your head and slowly begins to move forward. It feels like an enormous pressure, like a rubber band wrapped around your head. Your neck, shoulders and upper back ache. If you have experienced this feeling, you have experienced a tension headache.
According to the National Institutes of Health (NIH) over 40 million Americans suffer from chronic headaches. A headache is considered chronic when it occurs two or more times weekly for several months or longer. Most chronic headaches are tension headaches. 
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