Depression, as a mental disorder, is different from normal people. In terms of clinical manifestations, depressed patients are sad and sighing all day long, less talkative than usual, less active than usual, reluctant to go out, reluctant to do housework, poor appetite, not wanting to eat, obviously losing weight, not sleeping well, often having difficulty falling asleep, waking up early, etc. From the patient’s own experience, he or she may feel unhappy, uninterested in doing anything, feeling no energy, not wanting to move, afraid of meeting people, and feeling that his or her brain is not moving, and in severe cases, it is like rust, and memory is obviously not as good as before. In terms of social functioning, depressed patients’ performance in daily life, study and work is significantly lower than that of normal people.