The document discusses stress, defining it as the body's response to demands placed upon it. It describes stress as the "wear and tear" the body experiences when coping with environmental changes. The document outlines various types and causes of stress, including external stressors like work pressure and major life events, and internal stressors like negative self-talk. It also discusses the body's physiological response to stress through stages like alarm and resistance. Finally, it provides strategies for managing stress, such as changing one's thinking, adopting a balanced lifestyle, and using relaxation techniques.