Psychologists have viewed stress in 3 different ways: 1 as a stimulus. Stressors: eliciting stimuli or events that place strong demands on us: 2 as a response. Stress has cognitive, physiological, and behavioural components: 3 as an organism-environment interaction. Stress: a pattern of cognitive appraisals, physiological responses, and behavioural tendencies that occurs in response to a perceived imbalance between situational demands and the resources needed to cope with them. Whether stressors are physical or psychological, they place demands on us that endanger well-being, requiring us to adapt in some manner. Micro-stressors daily hassles and everyday annoyances. Catastrophic events often occur unexpectedly and typically affect large numbers of people. Major negative events such as being the victim of a major crime or sexual abuse, the death or loss of a loved one, an academic or career failure, or a major illness.