What are Tension Headaches?  

Tension headaches are the most common form of headache experience 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 most commonly caused from muscle tension in your neck, shoulders and upper back. This tension is sometimes the result of poor posture, and, less frequently some sort of trauma (like a car accident). More than 90% of tension headaches occur on both sides of the head. The pain is usually dull and can build gradually throughout the day.