The document discusses health psychology and the relationship between stress, coping, and illness. It describes stress as a biological reaction to external events that causes physiological responses. Prolonged or chronic stress can weaken the immune system and increase the risk of disease through a process known as the general adaptation syndrome. Stressful life events and daily hassles are associated with increased illness, though the perception of an event also influences its impact. Effective coping strategies like physical activity, social support, and developing a hardy outlook can help moderate the effects of stress on health.