Stress is simply reaction to a stimulus that disturbs our physical or mental equilibrium. When you feel threatened, your nervous system responds by releasing a flood of stress hormones, including adrenaline and cortisol, which rouse the body for emergency action.
Helps fight fatigue.
Remember that time you ate some funky chicken late at night and spent the rest of it tossing and turning with gas, bloating and interrupted dreams. Why? How? What’s happening here?