Stress is defined as the physical, mental, or emotional response to events that causes tension. There are two main types of stress: eustress, which is short-term positive stress that motivates and improves performance, and distress, which is negative stress that decreases performance and can lead to mental and physical problems. Common causes of stress include job insecurity, high performance demands, personal or family problems, and technology. Signs of stress include headaches, back pain, fatigue, sleep changes, and difficulty concentrating. Managing stress involves gratitude, time management, relaxation techniques like deep breathing, and addressing negative thoughts.