DSM IV (the Diagnostic and Statistical Manual of Mental Disorders) criteria for major depressive episode include, over a two week period or more,:

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The DSM IV criteria for major depressive episode includes symptoms such as depressed mood, loss of interest or pleasure in most activities, significant weight loss or gain, insomnia or hypersomnia, psychomotor agitation or retardation, fatigue or loss of energy, feelings of worthlessness or excessive guilt, difficulty concentrating or indecisiveness, and recurrent thoughts of death or suicidal ideation. Compulsive behaviors and psychologically induced tremors are not specifically included in the criteria, and blaming others for personal problems may be a symptom of another disorder (such as narcissistic personality disorder), but is not a symptom of major depressive episode.

DSM IV (The Diagnostic and Statistical Manual of Mental Disorders)