Stress is the body's reaction to pressure or demands placed on it that can negatively impact mental and physical health if prolonged. Stress can be positive by motivating performance but becomes negative if unrelieved. Most stress is self-generated from irrational beliefs and perceptions rather than external factors alone. Managing stress involves recognizing signs of distress, balancing activities with rest, controlling thoughts through reframing and positive self-talk, changing behaviors, and adopting a healthy lifestyle. Strategies like deep breathing, exercise, social support and putting problems in perspective can help reduce stress levels.