Mild depression may get better on its own without treatment, and the course of the illness is about 6-13 months. Studies have found that it is very unlikely that severe depression will get better without treatment, especially in severe depression with such thoughts of death or suicide, or even suicidal behavior, which must be treated with medication and a full dose and course of antidepressants. If mild depression is not treated, it may also lead to this cyclothymic disorder or bad mood, that is, the patient’s depressed mood for more than two years, during which he or she will rarely have a normal mood or a depressed mood, and will turn into a light manic state and lose his or her temper at the drop of a hat.