When people are in a bad mood and unhappy, they worry whether they are suffering from “depression”. The “depression” that people understand and the “depression” that doctors see are not the same thing. The clinical diagnosis of “depression” is divided into several cases, which are briefly described as follows: 1, first of all, the main manifestations of “depression”: depressed, depressed, unhappy, pessimistic and despairing in serious cases; low self-perception and self-evaluation, declining interest, no fun; slow thinking. The depressed person’s mood, depressed mood, unhappiness, pessimism and despair in severe cases; low self-esteem and self-evaluation, declining interest, no fun; slow thinking or thoughtfulness, indecisiveness, self-doubt, low self-esteem, negative view of various things; reduced behavior and movement, feeling of lack of strength, lack of energy, or fatigue, weakness, incompetence, demotivation, avoidance of social interaction, etc.; with difficulty in attention, memory loss, sleep disorders, loss of appetite and libido, as well as headaches, palpitations, chest tightness, gastrointestinal discomfort and other physical symptoms. 2.Psychological problems based on “depressive state”: the most common, most of these problems are caused by psychological stress, life frustration and other psychosocial factors, characterized by a short duration, relatively mild symptoms, work and life and other social functions are basically unaffected or slightly affected, and their emotional state is mostly only for specific life events, for The emotional symptoms do not appear in other situations. Although the person concerned also feels distressed, the problem can generally be solved through self-adjustment, social support, environmental and physical conditions change or receiving psychological counseling and psychotherapy. Neurotic depression: This kind of problem is clinically called “mild depressive disorder” and “bad mood”, which is also most of the cases that people understand as “depression”. Patients often have a certain personality base, they realize that there is no particular event that makes them “depressed”, but they still experience significant depressed mood, decreased interest, difficulty in thinking, decreased energy, reluctance to talk, reluctance to do things, and physical symptoms. This kind of problem cannot be solved by self-adjustment, and requires comprehensive treatment such as medication, psychological counseling and psychotherapy to obtain satisfactory results. 4, major depressive episode: clinically called “psychotic depression”, “endogenous depression”, or “depressive episode of mood disorder”, some are even “Depressive phase of bipolar disorder”. The causes of the disease are complex, mostly related to genetic factors, neurobiochemical factors in the brain and psychosocial factors. The patient’s symptoms are more serious, and in addition to all the symptoms of depression, severe cases may also show self-blame, self-guilt, loss of interest, despair and suicide, or not eating, not moving, not speaking, not being able to take care of themselves, and psychotic symptoms such as hallucinations and delusions. This disorder is characterized by the patient’s inability to recognize his or her illness and symptoms, and the patient’s inability to actively seek medical help. Because of the seriousness of the disease, the tendency to commit suicide, the difficulty of clinical treatment, and the ease of recurrence after cure, it should be given sufficient attention.