A bad state of mind is a persistent state of mind disorder in which depressed mood is the main clinical phase, which, strictly speaking, belongs to the category of mental illness. The clinical manifestations of bad mood are low or insufficient self-evaluation, general loss of interest and pleasure, fatigue, worry about the past, subjective irritability or special anger, decreased motivation, efficiency or creativity, reduced concentration, memory loss, and so on. Poor state of mind generally does not appear pessimistic and hopeless, suicidal and self-injurious behavior, generally does not meet the diagnostic criteria for depression. If the above symptoms occur, should go to the regular hospital psychiatric psychology department in time, follow the doctor’s instructions standardized treatment.