Stress is the body's normal reaction to events that upset its balance. The document outlines various symptoms of stress and causes of stress both external like major life changes and internal like pessimism. Chronic stress can lead to serious health issues. The document recommends managing stress through techniques like starting a stress journal, avoiding or altering stressors when possible, adapting one's perspective of stressors, accepting things that can't be controlled, and engaging in relaxing activities.