Tension headaches are the most common form of headache experienced by Americans today. Statistics show, as many as 95% of the U.S. population has at least one episode of tension headache in their lifetime. Tension headaches are usually caused from muscle tension in your neck, shoulders and upper back. It’s important to note that repetitively tense neck muscles are largely the result of underlying concerns such as nerve irritations that need correction. This tension is sometimes the result of poor posture, unsupportive pillows, repetitive motions and, less frequently some sort of trauma (like a car accident). Tension headaches may be exacerbated by emotional stress, fatigue, noise, or glare.