There are certainly illnesses that cause psychological symptoms, like Porphyria or lead poisoning, whose affect on the brain is understood. However, what I suspect you are talking about is 'disorders' which are a collection of symptoms defined by a committee. This distinction is central to the problem that psychiatry faces. How do we know that these disorders are not simply the extremes of genetic variability and not diseases at all?
If that were true, perhaps we should be looking at how best to help such people integrate into society rather that doping them with drugs to keep them 'under control'.



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