Stressful situations trigger a physical reaction known as the stress response.
Stressful situations trigger a physical reaction known as the stress response. The brain relays warnings to the muscles, which tighten, and to the adrenal glands, which release stress hormones such as adrenaline and cortisol. These hormones help your body prepare to fight or flee to safety: your heart pounds, blood pressure rises, and more of your blood is sent to your brain and muscles; your breath quickens to get more oxygen into your blood; and your body releases sugars and fats into the blood for energy.