This document discusses various causes of stress in 3 categories:
1. Survival stress and internal stress which are instinctual fight or flight responses and self-generated worrying.
2. Environmental stress from one's physical surroundings like noise, crowds, work/family pressures.
3. Fatigue from overwork at jobs, school, home which is difficult to avoid but builds up over time.
Major life changes, daily hassles, learning/work stresses, and social/internal factors are also discussed as stressors. Identifying causes is the first step to better managing stress.