What kind of disease is depression and whether it can be cured is the first concern of the sick person. Some patients are shocked when they hear the doctor say that they are suffering from depression. In fact, this is a complete misunderstanding, which is the reason why mental health knowledge is not popular. Depression is a very common mental illness abroad, and its prevalence is reported to be about 10% of the population, and the prevalence is higher in the better socio-economic classes. In our clinical practice, depression is also seen in people with high social level, good economic conditions and in a state of intense competition, so the occurrence of depression is closely related to social development. According to the survey, the prevalence of depression is not as high as that in foreign countries, there are several possibilities: 1, foreigners are more extroverted, easy to show their emotions, so they are also prone to emotional changes; while Chinese people have better patience and can restrain themselves when things go wrong. 2, foreign mental health knowledge is better, there is less discrimination with mental disorders, so what emotional changes, you can always find a psychiatrist to consult; in China, there is still a serious prejudice against people with mental disorders, so that people with mental disorders do not dare to go to the psychiatrist in time to receive advice, fearing that others gossip, to the detriment of their own future. 3, the fast pace of work abroad, the competition is intense, people are easy to tension fatigue. Failure to compete will undoubtedly cause emotional shock; although China has begun to enter a competitive society, but the traditional habit of “iron rice bowl” still exists, life is more secure, and the pace of work is much slower than abroad, so it does not constitute a strong emotional shock. For example, some countries have abolished the diagnostic name of neurasthenia and no longer distinguish between affective psychosis depression, depressive neurosis, reactive depression, menopausal depression, etc. They are all grouped under depression, so the range of diseases is relatively large and the prevalence is certainly high. This is an academic issue, so the reader does not have to go too far into the root of the problem, but of course, some introduction will be made in the future. At this point, the reader must not understand what kind of disease depression is. There are two meanings of depression in our country, the broad sense of depression includes affective psychosis, depressive neurosis, reactive depression, menopausal depression, etc.; the narrow sense refers only to affective psychosis depression, the depression introduced in this paper is mainly in the narrow sense, while other types will also be introduced. Whether in the broad sense or in the narrow sense, depression is a mental illness with a good prognosis, which means that the disease can be completely cured, and there will be no sequelae after it is well, and it can work, study and live as before the onset. However, depression in affective psychosis has the potential for recurrent episodes, so the patient should work closely with the doctor and take effective measures. After the last episode is well, it is important to prevent future episodes, but even after multiple episodes, the mental state remains normal when there are no episodes, and this period is called the interval. Affective psychosis is a mental illness with high or low mood as the main manifestation, also known as manic-depressive disorder. Some patients have recurrent episodes of mania or depression, called monophasic affective psychosis; some patients have recurrent episodes of both mania and depression, called bipolar affective psychosis, with slight differences in the specific treatment of the two, and the latter has more episodes. Although depression is a good healing disease, but the patient is very painful at the onset, can not see their own future, if the traditional prejudice, and not timely to go to the psychiatric specialist for early diagnosis and treatment, delaying the disease, suffering lasting pain since not to mention, more unfortunately, some patients to take suicidal behavior and leave the earth, this case is too much, the author has heard a lot. Generally, the family does not show remorse until a serious situation has occurred, but it is too late to regret. For such a good prognosis of the disease, the patient himself should not destroy himself, the family should be more sensible, not to lose the time to consult a specialist, not in other clinical departments have been bouncing around, but not to find a psychiatrist, if so, once the serious consequences, the family is indeed a certain responsibility.