Biopsychosocial model: holds that physical illness is caused by a complex interaction of biological, psychological and sociocultural factors. Psychosocial factors such as stress and lifestyle play a large role in development of chronic diseases. Health psychology: is concerned with how psychosocial factors relate to the promotion and maintenance of health and with the causation, prevention and treatment of illness. Stress: any circumstance that threatens or are perceived to threaten one"s well being and that thereby tax one"s coping abilities. Routine hassles may have significant harmful effects on mental and physical health. Stress adds up, collectively small stressors create great strain. Appraisal: stress lies in the eye of the beholder. Events stressful for one person maybe routine for another. Primary appraisal: is an initial evaluation of whether an event is: 1-irrelevant to you, 2- relevant but not threatening or, 3- stressful. Secondary appraisal: which is an evaluation of your coping resources and options for dealing with stress.