Thought I'd update that list of indicators of depression. This is straight from the DSM IV, the psychological diagnostic book that distinguishes various mental disorders, though, like Snowy said, this stuff shouldn't be taken as the be-all end-all. There is a lot more to it than just these things and the DSM is only used as a beginning point. If you're feeling this way or recognise the symptoms in someone else, try to get some help. Really. These are symptoms of a MAJOR DEPRESSIVE EPISODE meaning its as bad as it can possibly get. An episode is different from a disorder though because if it's a disorder, it keeps occurring, with bouts of feeling relatively normal and on top of things.
A. Five (or more) of the following symptoms have been present during the same 2-week period and represent a change from previous functioning; at least one of the symptoms is either (1) depressed mood or (2) loss of interest or pleasure.
Note: Do note include symptoms that are clearly due to a general medical condition, or mood-incongruent delusions or hallucinations.
(1) depressed mood most of the day, nearly every day, as indicated by either subjective report (e.g., feels sad or empty) or observation made by others (e.g., appears tearful). Note: In children and adolescents, can be irritable mood.
(2) markedly diminished interest or pleasure in all, or almost all, activities most of the day, nearly every day (as indicated by either subjective account or observation made by others)
(3) significant weight loss when not dieting or weight gain (e.g., a change of more than 5% of body weight in a month), or decrease or increase in appetite nearly every day. Note: In children, consider failure to make expected weight gains.
(4) insomnia or hypersomnia nearly every day
(5) psychomotor agitation or retardation nearly every day (observable by others, not merely subjective feelings of restlessness or being slowed down)
(6) fatigue or loss of energy nearly every day
(7) feelings of worthlessness or excessive or inappropriate guilt (which may be delusional) nearly every day (not merely self-reproach or guilt about being sick)
(8) diminished ability to think or concentrate, or indecisiveness, nearly every day (either by subjective account or as observed by others)
(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
Depression doesn't always mean a low mood though - it can be a sullen, aggressive one depending on the person. My lecturer has some tricks for dealing that I will hopefully consult him for next week sometime
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Remember, talk to someone, anyone. Go to a counsellor/psychologist. Talking does help.