Depression is a psychiatric disorder with mild to moderate severity. Some depressive episodes result in loss of normal work ability and inability to participate in normal social activities. Moreover, the treatment of depression has a certain course of treatment, the disease treatment is slow to take effect and the treatment course is long, so people who suffer from depression can take long-term sick leave. In general, because depression has a long course of illness and requires long-term treatment, long-term sick leave can be obtained by providing the employer with a relevant medical diagnosis.