Stress is the body's reaction to pressure or demands placed on it that can negatively impact physical and mental 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. Managing stress involves changing thinking patterns, behaviors, and lifestyle habits like exercise, diet, and relaxation. Strategies include reframing problems positively, asserting control over time, taking breaks, joining social support, deep breathing, exercise, and maintaining a balanced lifestyle.