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 *  Symptomology- identification of systems
 *  Why patients suffer from the disorder = the etiology
 *  'lifetime prevalnce' is the percentage of the population that will experience the disorder at some time in their life.
 *  'onset age' is the average age at which the disorder is likely to appear.
 *  **Anxiety disorders**
 *  Have a form of irrational fear as the central disturbance.
 *  **Affective disorders**
 *  Dysfunctional moods
 *  **Eating disorders**
 *  Eating patterns which lead to insufficient or excessive intake of food.
 *  Levels of analysis used in diagnosing depression
 *  Biological factors- genetic makeup, biochemical factors
 *  Cognitive factors such as thoughts of hopelessness, pessimistic thinking, low self-esteem
 *  Social factors- stress of poverty, loneliness, or troubled personal relationships.
 *  Symptoms of major depressive disorders
 *  Affective
 * <span style="direction: ltr; direction: ltr; direction: ltr; margin-bottom: 0in; margin-bottom: 0in; margin-left: .2902in; margin-left: .375in; margin-top: 0in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Feelings of guilt and sadness, lack of enjoyment or pleasure in familiar activities or company
 * <span style="direction: ltr; direction: ltr; margin-bottom: 0in; margin-left: .2902in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Behavioural
 * <span style="direction: ltr; direction: ltr; direction: ltr; margin-bottom: 0in; margin-bottom: 0in; margin-left: .2902in; margin-left: .375in; margin-top: 0in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Passivity; lack of initiative
 * <span style="direction: ltr; direction: ltr; margin-bottom: 0in; margin-left: .2902in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Cognitive
 * <span style="direction: ltr; direction: ltr; direction: ltr; margin-bottom: 0in; margin-bottom: 0in; margin-left: .2902in; margin-left: .375in; margin-top: 0in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Frequent negative thoughts, faulty attribution of blame, low self-esteem, suicidal thoughts, irrational hopelessness, may also experience difficulties in concentration and inability to make decisions
 * <span style="direction: ltr; direction: ltr; margin-bottom: 0in; margin-left: .2902in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Somatic
 * <span style="direction: ltr; direction: ltr; direction: ltr; margin-bottom: 0in; margin-bottom: 0in; margin-left: .2902in; margin-left: .375in; margin-top: 0in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Loss of energy, insomnia, or hypersomnia, weight loss/gain, diminished libido
 * <span style="direction: ltr; direction: ltr; margin-bottom: 0in; margin-left: .2902in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Charney and Weismann- 1988 m. depressive disorder affecting 15 per cent of people at some time in their life.
 * <span style="direction: ltr; direction: ltr; margin-bottom: 0in; margin-left: .2902in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Depression is a recurrant disorder- 80% experiencing a subsequent episode, episode typically lasting for three to four months.
 * <span style="direction: ltr; direction: ltr; margin-bottom: 0in; margin-left: .2902in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Etiology
 * <span style="direction: ltr; direction: ltr; margin-bottom: 0in; margin-left: .2902in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> In majority of cases development and course reflects complex interactions between different biological and psychological factors.
 * <span style="direction: ltr; direction: ltr; margin-bottom: 0in; margin-left: .2902in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> High stress does not automatically result in the development of depression.
 * <span style="direction: ltr; direction: ltr; margin-bottom: 0in; margin-left: .2902in; margin-top: 0in; margin-top: 0in; unicode-bidi: embed; unicode-bidi: embed; vertical-align: middle;"> Researchers argue that genetic predisposition can partly explain depression