Stress can be caused by both positive and negative situations. It refers to the body's reaction to perceived threats or demands. Stress occurs when environmental demands exceed a person's ability to cope. There are three stages of stress - alarm, resistance, and exhaustion. Sources of stress can be individual factors like personality or health, organizational factors like workload or role conflicts, and environmental factors like natural disasters. Stress can lead to physiological, behavioral, and psychological symptoms. Managing stress involves strategies at the organizational level like job redesign and counseling, and at the individual level like time management, relaxation, and developing a positive attitude. Detached involvement means being attached to one's actions but not the results, which is key to inner peace.