Answer:
Health psychology is the sub-field of psychology that establishes and to maintains the well being of a person. The health psychologist collaborates with the other field psychologist and works at well being and maintain the relationship of human beings.
Health psychology is the area that focuses on a person's social, psychological and behavioral aspects. Behavior psychology and medicine psychology is the combination of health psychology. Both mental health and well being of a person affects by many factors in society.
It also focused on people's behavior, how they react in a situation and why they do so. The government also play a role in health psychology by promoting health policies.