Some people say that depression is the cold of the mind, and I think that is debatable. The flu is common in the population, and so is depression, but depression is not as easy to diagnose and treat as the flu, and it does not end as easily as the flu. This statement underestimates the seriousness of depression. In essence, it is a misunderstanding of depression and depression. Depression and depression, one word for another, are very different. In our colloquial language, depression can mean either “depressed mood”, “depressed state”, or “depression”. We should not therefore equate depressed mood with depression. The former is a normal and natural emotional response, while the latter is a state of mind disorder. The main differences between the two are as follows. 1. It is normal to be depressed when something less than desirable happens, such as losing what you had or feeling disappointed. However, it is characteristic of depression if you distort your thoughts and get bogged down in negative thoughts? 2. The emotionally depressed person knows it clearly. Or subconsciously know. This unhappiness is going to pass. And depressed people feel that they will also be so unhappy in the future. 3. The depressed person can achieve the purpose of easing the low mood by distracting himself or herself or doing other work. Whereas depressed people are haunted by depressed feelings all day long and last for a long time. 4. People who are depressed do not significantly affect their relationships, academic performance or job performance. In contrast, depressed people’s interpersonal relationships, academic performance or job performance are greatly affected. In summary, although we do not like the feeling of depression, this emotional reaction is a normal and natural psychological phenomenon, and it is not appropriate to compare depression to the cold of physical illness. To be more precise, we can compare “depressive state” to “cold”. Mental health in the absolute sense does not exist, but to reach the level of depression, it is necessary to analyze carefully.