<unk>  characteristics include an extended period of depressed mood combined with at least two other symptoms which may include insomnia or hypersomnia, fatigue or low energy, eating changes (more or less), low self-esteem, or feelings of hopelessness. Poor concentration or difficulty making decisions are treated as another possible symptom. Irritability is one of the more common symptoms in children and adolescents. Mild degrees of<unk>  may result in people withdrawing from stress and avoiding opportunities for failure. In more severe cases of<unk> , people may withdraw from daily activities. They will usually find little pleasure in usual activities and pastimes. Diagnosis of<unk>  can be difficult because of the subtle nature of the symptoms and patients can often hide them in social situations, making it challenging for others to detect symptoms. Additionally,<unk>  often occurs at the same time as other psychological disorders, which adds a level of complexity in determining the presence of<unk> , particularly because there is often an overlap in the symptoms of disorders. There is a high incidence of comorbid illness in those with<unk> . Suicidal behavior is also a particular problem with those with<unk> . It is vital to look for signs of major depression, panic disorder, generalised anxiety disorder, alcohol and substance use disorders, and personality disorder.
Dysthymia
Euthymia 
Cyclothymia
Myokymia
Congenital athymia
Minor depressive disorder
Atypical depression
Panic disorder