When the body encounters stress, it undergoes several physiological changes, primarily through the activation of the fight-or-flight response. This involves the release of stress hormones, such as adrenaline and cortisol, leading to increased heart rate, rapid breathing, and heightened alertness. Blood flow is redirected to the muscles and vital organs, preparing the body for immediate action. Prolonged stress can have detrimental effects, including increased blood pressure, disrupted metabolism, and a weakened immune system. Understanding these responses can help in managing stress effectively for better health and performance.