For the diagnosis of major depression to be made, a depressed mood or loss of interest or pleasure in almost all activities must be present for at least two weeks and at least four of the following symptoms must be experienced: sleep disturbance (usually early morning awakening), fatigue or loss of energy, feelings of worthlessness or excessive guilt, diminished ability to concentrate or make decisions, agitation (anxiety or restlessness) or slowed movements, change in appetite with or without weight loss, and recurrent thoughts of death or suicide.
Dysthymia, or minor depression, is the presence of a depressed mood for most of the day for two years with no more than two months ' freedom from symptoms. In addition at least two of the following symptoms must occur concurrently with the depression: disruption in eating habitspoor appetite or overeating; disturbed sleeping patterninsomnia or hypersomnia; low energy or fatigue; low self-esteem; poor concentration or difficulty making decisions; and a feeling of hopelessness.
Bipolar disorder or manic depressive disorder is characterized by recurrent episodes of mania and major depression. Most of those who suffer from this condition (60 to 80 percent) initially manifest a manic phase, followed by depression. Manic symptoms consist of feelings of inflated self-esteem or grandiosity, a decreased need for sleep, unusual loquacity, and an unconnected flow of ideas, distractibility, or
References: 1. Psychology: An Introduction (12th Ed.), Morris& Maisto. 2. Sierra Tucson, www.seirratucson.com 3. Everyday Health, www.everydayhealth.com