Is chronic pain very common?

It has been estimated that as many as one-third of all Americans suffer from continuous or recurrent pain, and tens of millions are partiallu or completely disabled by their pain. Although psychological factors rarely are the source of chronic pain, they can encourage and intensify the pain, contribute to maintaining it, and increase the anguish and disability of chronic pain condition. In recent years, doctors have begun teaming up with or referring patients to health psychologists who can help them deal more effectively with pain. The psychologist may recommend increased activity and exercise or changes in diet, since chemicals such as monosodium glutamate and caffeine contribute to pain, particularly headache. The psychologists may also use specific treatment methods, such as operant conditioning, biofeedback, and relaxation.