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Physiological or biological stress is an organism's response to a stressor such as an environmental condition. Stress is a body's method of reacting to a challenge. According to the stressful event, the body's way to respond to stress is by sympathetic nervous system activation which results in the fight-or-flight response.
Trauma and stress. Some events are so stressful that they overwhelm us, and no amount of deep breathing or positive thinking can help. Accidents, injuries, abuse, violence, war, serious threats to physical safety, or the sudden death of a loved one are examples of traumas that cause a stress response within the body.