Stress is an unavoidable and necessary part of life.
It helps the mind and body deal with life's challenges, such as an algebra test, a job interview, or another driver pulling out in front of us. It accelerates the heart rate, rushes adrenalin to the muscles, and makes people mentally alert. But too much stress is harmful. If it doesn't disappear after the challenge is met, or if challenges occur too often, then it can affect both mental and physical health. Dealing with and reducing stress can improve both physical and mental health.