Your body always behaves in a way to support your well-being. When you are stressed your body prepares you for physical action ? the fight or flight response, because this function has not evolved from caveman times when stress meant running away to save your life, or your dinner!
When you are stressed your brain chemicals and memory function changes; your digestive system shuts down and your blood pressure rises. Also, fats such as cholesterol and triglycerides are released in to your bloodstream and your blood sugar increases to provide the energy needed for physical action. Yet action is often the last thing that takes place these days when we are stressed. This can result in depression, disturbed sleep, increased blood pressure and cholesterol levels and digestive malfunction and many other serious long-term health issues if you do not get your stress levels under control.