The term 'cause of burnout' can be summarized as 'STRESS'. STRESS is a feeling of emotional or physical tension that can be caused by external or internal factors. It is a normal part of life, but when it becomes too much, it can lead to burnout. Burnout is a state of physical, mental, and emotional exhaustion caused by prolonged STRESS. It can lead to feelings of helplessness, hopelessness, and worthlessness.