This document discusses stress, its causes and effects on health. It defines stress as any demand on the mind and body. The Yerkes-Dodson principle notes that a moderate amount of stress can increase performance, while too little or too much stress decreases it. Stress can be positive (eustress) or negative (distress). Acute stress is short-term while chronic stress is long-lasting. Sources of stress include time management, relationships, health, and daily hassles. The document emphasizes seeking balance in life to prevent and manage stress through eliminating stressors, changing one's thinking, and stress management techniques.