(1) Depressed mood (or alternatively can be irritable mood in children and adolescents).
(2) Markedly diminished interest or pleasure in all, or almost all, activities.
(3) Significant weight loss when not dieting or weight gain or decrease or increase in appetite.
(4) Insomnia or hypersomnia.
(5) Psychomotor agitation or retardation.
(6) fatigue or loss of energy
(7) Feelings of worthlessness or excessive or inappropriate guilt.
(8) Diminished ability to think or concentrate, or indecisiveness.
(9) Recurrent thoughts of death (not just fear of dying), recurrent suicidal ideation without a specific plan, or a suicide attempt or a specific plan for committing suicide.

From: Light Therapy for Seasonal Affective Disorder (SAD)

Cover of Minnesota Health Technology Assessments
Minnesota Health Technology Assessments [Internet].
Minnesota Health Technology Advisory Committee.
St. Paul (MN): Minnesota Department of Health; 1995-2001.
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