Abnormalities in the function of the body can be caused by a variety of stresses, illness or injury, causing a state of disharmony which interferes with natural health. By removing these blocks, both physical and mental, the body is revitalised and can work effectively and energetically to heal itself. Chiropractic is a method of realigning the bones in the spine and joints by subtle adjustments, thereby influencing the nervous system and natural defence mechanisms to alleviate pain and improve general health. Because of its effectiveness in treating back problems, headaches and other injuries and traumas, chiropractic has become the second largest primary health care field in the world.