Public psychology refers to the skilled observe of school, counseling, and psychotherapy with some of the foremost seriously unstable, indigent, and marginalized people in society. Health psychology is the study of psychological and activity processes in health, illness, and health care. It is involved with understanding however psychological, behavioral, and cultural factors contribute to physical health and health problem. Psychological factors can affect health directly. Behavioral factors can also affect a person's health. Health psychologists take a bio psychosocial approach. In alternative words, health psychologists perceive health to be the merchandise not solely of biological processes (e.g., a virus, tumor, etc.) however additionally of psychological (e.g., thoughts and beliefs), behavioral (e.g., habits), and social processes (e.g., socioeconomic status and ethnicity).