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Medical psychology (related to Clinical Health Psychology, Psychosomatic Medicine, and Behavioral Medicine') is a branch of clinical psychology where clinicians have trained in the biological aspects of mental illness in relation to physical illness, and are usually qualified to prescribe medication; this last aspect varies from country to country. It adopts the biopsychosocial approach to medicine, which revolves around the idea that both the body and mind are indivisible, and that disease and illness are not identical. Continuing with this line of thought, all diseases whether of the mind or of the physical body must be treated as if they have both been affected. The intent of Medical Psychology is to apply knowledge from all branches of social, psychological, and biological medicine in the prevention, assessment, and treatment of all forms of physical illness and the adaptation to illness; specific behavioral, psychotherapeutic, and pharmaceutical methods are used to help the person respond to illness and prevent further illness through matching coping and management skills to the person’s abilities, character, and personality style.

Some clinical practitioners and philosophers today believe that this Cartesian line of thought is outdated. Some anecdotal evidence has been raised concerning the lack of effective treatment for things such as migraines, pains and cancer and that perhaps the cure should not only be centred on the body but also the mind. Some also raise the argument that most uncurable diseases are brought about not merely by physical ailments, but by mental problems. All evidence is of course unproven and will likely remain as such for a long time to come.

The contribution of medical psychologists to general health care increased with their use as primary care doctors in the world's largest HMO, the California Kaiser Permanente. These psychologists work along with primary care physicians in order to determine optimum treatment plans for all patients with physical and/or mental illnesses.

An important contribution of medical psychology is in the education of patients (psychoeducation) in disease processes. Frequently, such education of the patient and the family insures substantially better adherence to treatment recommendations. Medical psychologists are particularly successful in the treatment of asthma, gastrointestinal illnesses, cardiac conditions, spinal cord and brain injuries, chronic pain, headaches, and addictions (drugs, smoking, eating, alcohol, etc.).

Training in medical psychology entails a doctoral degree (Ph.D., or Psy.D.) in clinical psychology, an internship, and postdoctoral training in one of the branches of medicine traditionally associated with psychological fields: psychosomatic medicine, rehabilitation, neuropsychology (central nervous system functioning - brain functions), substance abuse, pain medicine, among others.

• Health psychology

• Medical Psychology Graduate Program at The University of Alabama at Birmingham