One of the two schools of medicine in the United States, the Doctor of Osteopathy or DO has the similar credentials of an Allopathic Doctor or MD, but a minimum of 200 hours of hands on training in physical diagnosis and treatment before they graduate medical school.
Frustrated with the traditional medicine of the time, the founder of Osteopathic Medicine Dr. Andrew Taylor Still, developed a method of diagnosis and treatment based of the follow tenants:
The body is a unit
The body is able to heal itself
Structure and function are related at all levels
Rational treatment of a person should be guided by the above principals
Therefore, it can be summarized that if the barriers for disease are removed through proper anatomic alignment, the body has the ability fix itself.