How Chronic Stress Can Be Harmful To Health? Introduction Stress is a warning sign which produces fight or flight response in the body. It is the body’s natural defense against predators and dangers. The body produces chemicals called cortisol, adrenaline and noradrenaline which further increases the heart rate leading to sweating and increased alertness. Stress can have positive and negative effects on the body. Positive or Good stress is a burst of energy that can motivate a person to attain