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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.
Celebrations and tragedies alike can cause a stress response in your body. All of your feelings, positive or negative, create physiological changes. Your skin, heart rate, digestion, joints, muscle energy levels, the hair on your head, and countless cells and systems you don't even know about change with every emotion.