Neck pain is often associated with muscle tension and joint locking or Vertebral Subluxation in the neck. Australians are not as active as in the past, and more hours are spent in one posture, such as sitting in front of a computer, desk or machinery. Sleeping position and poor pillow support can also be realted. This can increase joint irritation and muscle tension in the neck and upper back causing pain. Injuries are also a common cause of neck pain, including whiplash trauma, sporting injuries and repetitive strain.