Stress is a normal reaction to everyday pressures, but can become unhealthy when it upsets your day-to-day functioning. Stress involves changes affecting nearly every system of the body, influencing how people feel and behave.
By causing mind–body changes, stress contributes directly to psychological and physiological disorder and disease and affects mental and physical health, reducing quality of life.
Adapted from the APA Dictionary of Psychology
Coping with stress
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