Stress is the body's normal physical response to events that can be helpful in emergency situations by providing extra strength, but prolonged stress stops being helpful and can damage health. Signs of stress overload include cognitive, emotional, physical, and behavioral symptoms. Common causes of stress are major life changes, relationships, work, finances, and internal factors like pessimism or perfectionism. Stress management strategies include avoiding unnecessary stress, altering situations when possible, adapting to stressors, accepting things that can't be changed, making time for relaxation, and maintaining a healthy lifestyle.