Among the criteria for a major depressive disorder, at least five of the following symptoms have to have been present during the same 2-week period (and at least one of the symptoms must be diminished interest/pleasure or depressed mood):
Depressed mood: For children and adolescents, this can also be an irritable mood
Diminished interest or loss of pleasure in almost all activities (anhedonia)
Significant weight change or appetite disturbance: For children, this can be failure to achieve expected weight gain
Sleep disturbance (insomnia or hypersomnia)
Psychomotor agitation or retardation
Fatigue or loss of energy
Feelings of worthlessness
Diminished ability to think or concentrate; indecisiveness
Recurrent thoughts of death, recurrent suicidal ideation without a specific plan, or a suicide attempt or specific plan for committing suicide
For more on depression, read here.
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Cite this: Richard H. Sinert. Fast Five Quiz: Are You Familiar With Stress-Related Medical Conditions? - Medscape - Aug 28, 2015.