With the popularization of mental health knowledge, we know more or less about depression, and even some of my acquaintances say when they see me, I’m not happy lately, do I have depression and so on. In fact, there is a difference between normal people’s bad mood and depression: 1, normal people’s bad mood generally lasts for a short time; while depression is a long time. 2, normal people in a bad mood depression degree is generally mild; and depression is the degree of heavy. 3, normal people in a bad mood can adjust themselves to overcome; and depression is unable to extricate themselves. 4, normal people can correctly assess themselves when they are in a bad mood; while depression is low evaluation. 5, normal people in a bad mood can make up for the loss; while depression is low will. 6, normal people have the need for interpersonal interaction when they are in a bad mood; while depression does not go out. 7, normal people in a bad mood can correctly evaluate matters; while depression is very dark. 8, normal people in a bad mood have a bright vision of the future; while depression is no future.