Nine out of ten Americans suffer from headaches -ranging from dull and occasional to constant and debilitating. And although headaches may be common, they are not normal. The cause of headaches is often multi-factorial and can be triggered by environmental stimuli, food sensitivities, or behaviors. But the greatest majority of headaches are associated with muscle tension in the neck. Nowadays, people are engaged in more sedentary activities and more hours are spent in one fixed posture (ie: sitting in front of a computer). This can lead to joint irritation and tension in the upper back, neck, and scalp; thus, causing your head to ache.