Psychologists who strive to understand how biological, behavioral, and social factors influence health and illness are called health psychologists. The term “health psychology” is often interchanged with the terms “behavioral medicine” or “medical psychology.” In contemporary research and medical settings, health psychologists work with many different health care professionals (e.g., physicians, dentists, nurses, physician’s assistants, dietitians, social workers, pharmacists, physical and occupational therapists, and chaplains) to conduct research and provide clinical assessment and treatment services.