Quote From: tompainChemical imbalance is a simplification of the language sometimes used by drug companies [1 in the United States in advertising and consumer literature for psychoactive drugs after deregulation of pharmaceutical advertising. The term has its origins in the 'chemical hypothesis', which refers to a simplification of the series of hypothesised neurochemical changes thought to partially underly mental illness. This term is most often used by groups critical of the pharmaceutical treatment of mental illness [2. 
 
Chemical imbalance theory is not a scientific theory, but refers to the lay conception of a theory generated by the use of the term 'chemical imbalance'. Current research in neuroscience does indicate roles for changes in the operation of neurotransmitters in the brain, and changes in neurons and neural structure in the pathophysiology of mental illness, but current models are more complex than simple chemical balances/imbalances. Causality (i.e. whether neurotransmitter changes cause mental illness or whether mental illness affects neurotransmitter levels) is uncertain. 
 
Changes in levels of neurotransmitters and other neural level phenomena are hypothesised to be the underlying psychopathology for certain mental illnesses, notably clinical depression and schizophrenia. In 1965, Joseph Schildkraut hypothesized that depression was associated with low levels of norepinephrine in the brain, and later researchers thought serotonin might be the culprit.[3 Initially, relatively simple changes in the level of these neurotransmitters were thought to be found in individuals with depression. However, advanced findings began to fine tune the more simple explanations. For example, certain drugs used to treat depression were found to change the levels of neurotransmitters for several days, but then return to normal, well before any effect was observed on the depressive episode. Such findings implicate more complex mechanisms, such as changes in neurotransmitter production, transmission, re-uptake, and neural sensitivity. 
In addition to depression, changes in levels of neurotransmitters have also been implicates in anxiety disorders, bipolar disorder (manic depressive disorder), schizophrenia, and Parkinson's disease. As well as changes in serotonin and norepinephrine, dopamine systems have also been considered. 
 
So, while all biology is essentially chemical in nature, rather than being caused by simple chemical imbalances, mental illness is now widely recognized to be caused by complex and, in many cases, as yet unknown factors. 
 
Critics of the claims by pharmaceutical companies that their drugs 'correct' chemical imbalances in the brain contend drug treatments, intended to alter neurochemical processes by manipulating neurotransmitter levels, are neither an efficacious nor scientifically sound method for improving mental health, noting the enormous number of different chemicals and their unknown interactions. Moreover, critics assert, the psychiatric establishment assumes patients having a ‘mental illness’ must have a ‘chemical imbalance’ in their brain, as subjective diagnostic checklists are used in lieu of actual medical tests. This may not be so relevant to more recent graduates, who should be aware of the current state of neuroscience research. 
 
Even if neurological and neurochemical differences are associated with certain behaviors, the practice of pathologizing these behaviours has been questioned. Because neural mechanisms imply a physiological pathology underlying mental illnesses, they appear to justify the use of medication in treatment. Critics argue that the legitimacy given to medication by neural mechanisms can lead to an over-reliance on medication. Similarly, the perceived efficacy of medication as a treatment implies an underlying neural mechanism. A further issue is the extent to which research into neural mechanisms and the efficacy of medication is funding by pharmaceutical companies, who have an obvious vested interest in the use of medication. 
The chemical imbalance theory, according to critics, is routinely presented as ‘fact’ so often it has become widely accepted as fact, despite having been challenged repeatedly.  
 
The Pfizer drug company has been promoting Zoloft for years with saturation marketing, in print, on television, and on the radio, starring a miserably depressed ovoid creature. The ads assert mental illness may be due to a chemical imbalance in the brain, and that "Zoloft works to correct this imbalance." Without mentioning its own name, Eli Lilly urges viewers to seek treatment for depression, and to visit their website, DepressionHurts.com, because "Many researchers believe depression is caused by an imbalance of naturally occurring chemicals, serotonin and norepinephrine, in the brain and the body." 
 
According to Jaelline Jaffe and Jeanne Segal, "The misconception the commercials foster is that the brain somehow develops a chemical imbalance and the result is depression, occurring in a single directional process. In fact, the relationship between brain chemistry and experience is a two-directional phenomenon: Life experience affects brain chemistry at least as much as brain chemistry affects life experience. The 'chemical imbalance' hypothesis is not wrong. It's just not entirely correct." 
 
Psychiatric diagnostic practices in the United States have come under sharp criticism for reliance upon the chemical imbalance theory rather than actual medical testing. For example, in a Florida psychiatric hospital study from the 1980s, one hundred patients diagnosed with a mental illness were subsequently given a complete medical exam, after which it was discovered nearly half of the patients’ psychiatric problems were secondary manifestations of an undiagnosed medical problem.[4 Most, if not all hospitals in the United States currently require a medical exam be done on all patients admitted to an inpatient psychiatric unit. The author of the study, psychiatrist Mark Gold, remains a strong advocate that addiction and psychiatric disorders are rooted in complex chemical imbalances and effective treatment is available from various drug treatments, whether voluntary or involuntary, an opinion that he shares with the majority of the medical community. 
Further controversy is engendered by the links between some critics of psychiatry and the Church of Scientology. While Anti-psychiatry is not equivalent to Scientology, Scientology maintains several organizations like the Citizens Commission on Human Rights which have been outspoken critics of the biological basis of mental illness, sponsoring websites critical of "chemical imbalance" [5[6. There may exist a conflict of interest as Scientology advocates and sells an alternative and expensive non-pharmacological treatment known as Dianetics. 
 
http://en.wikipedia.org/wiki/Chemical_imbalance_theory 
thanks tom pain for the info
lot to look up......MAKES NO SENCE ....EVERY SCHIZIIFRENIC THAT I KNOW, HAS BEEN THOUGH EVERY PILL IN THE [SCHIZIOPHRENIC BOOK] AND THEY ARE STILL NOT BETTER.
IF IT WERE A SPECIFIC BRAIN CEMICAL....AND YOU GAVE IT TO THEM THEY WOULD BE [CURED]...BUT THERE NOT...THERE JUST GUINY PIGS , FOR THE NEWES DESINER DRUG.
VITIMIN -C , CURSE SCERVY
HALADAL. MAKES YOU A DROOOLING , ZOMBY....IT DOSNT CURE ANY THING,IT JUST BLUNTS THERE ....AFECT...OR SOME SUCH THERIE.
I WANT TO SEE A CURE......NOT A LIFE TIME OF DRUG DEPENDENCE!!!!!!!!
TO MAKE THE DRUG COMPANYS RICH-----ER :(
PEACE
OM MOTHER LIFE FORCE
OM GODDESS OF AVALON
ONLY ONE LIFE FORCE
OM........... FRED12 THANK YOU AGAIN!!!!!!!!!!