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Delusions: One the cardinal symptoms of paranoia and other disorders, most notably schizophrenia. [...]
Well, while delusions are a very important characteristic symptoms of Schizophrenia, hallucinations are just as significative for the diagnosis. For instance, you need only one Criterion A symptom if delusions are bizarre or hallucinations consist of a voice keeping up a running commentary on the person's behavior or thoughts, or 2+ voices conversing with each other.
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Here it is a slightly different perspective on the issue, fortune:
"If you talk to God, you are praying; If God talks to you, you have schizophrenia. If the dead talk to you, you are a spiritualist; If you talk to the dead, you are a schizophrenic."
-Thomas Szaz.
While people behave and think in ways that are very disturbing, this does not mean they have a disease. To Szasz, people with mental illness have a "fake disease," and these "scientific categories" are in fact used for power controls. Schizophrenia is "the sacred symbol of psychiatry" and, according to Szasz, simply does not exist. To be a true disease, the entity must somehow be capable of being approached, measured, or tested in scientific fashion. According to Szasz, disease must be found on the autopsy table and meet pathological definition instead of being voted into existence by members of the American Psychiatric Association. Mental illnesses are "like a" disease, argues Szasz, putting mental illness in a semantic metaphorical language arts category. Psychiatry is a pseudo-science that parodies medicine by using medical sounding words invented over the last 100 years. To be clear, heart break and heart attack belong to two completely different categories. Psychiatrists are but "soul doctors", the successors of priests, who deal with the spiritual "problems in living" that have troubled people forever. Psychiatry, through various Mental Health Acts has become the secular state religion. It is a social control system, which disguises itself under the claims of scientificity. The notion that biological psychiatry is a real science or a genuine branch of medicine has been challenged by other critics as well, such as Michel Foucault in "Madness and Civilization."
State government by enforcing the use of shock therapy has abused Psychiatry with impunity according to Szaz. If we accept that "mental illness" is a euphemism for behaviors that are disapproved of, then the state has no right to force psychiatric "treatment" on these individuals. Similarly, the state should not be able to interfere in mental health practices between consenting adults (for example, by legally controlling the supply of psychotropic drugs or psychiatric medication). The medicalization of government produces a "therapeutic state," designating someone as "insane" or as a "drug addict". In "Ceremonial Chemistry" (1973), he argued that the same persecution which has targeted Witches, Jews, Gypsies or homosexuals now targets "drug addicts" and "insane" people. Szasz argued that all these categories of people were taken as scapegoats of the community in ritual ceremonies.
To underscore this continuation of religion through medicine, he even takes as example obesity: instead of concentrating on junk food (ill-nutrition), physicians denounced hypernutrition. According to Szasz, despite their scientific appearance, the diets imposed were a moral substitute to the former fasts, and the social injunction not to be overweight is to be considered as a moral order, not as a scientific advice as it claims to be. As with those thought bad (insane people), those who took the wrong drugs (drug-addicts), medicine created a category for those who had the wrong weight (obeses). Szasz argued that psychiatrics were created in the 17th century to study and control those who erred from the medical norms of social behavior; a new specialization, "drogophobia", was created in the 20th century to study and control those who erred from the medical norms of drug consumption; and then, in the 1960s, another specialization, "bariatrics", was created to deal with those who erred from the medical norms concerning the weight which the body should have. Thus, he underscores that in 1970, the American Society of Bariatic Physicians (from the Greek baros, weight) had 30 members, and already 450 two years later.
Drug addiction is not a "disease" to be cured through legal drugs (Methadone instead of heroin; which forgets that heroin was created in the first place to be a substitute to opium), but a social "habit". Szasz also argues in favor of a drugs free-market. He criticized the "war on drugs", arguing that using drugs was in fact a victimless crime. Prohibition itself constituted the crime. He shows how the "war on drugs" lead states to do things that would have never been considered half a century before, such as prohibiting a person from ingesting certain substances or interfering in other countries to impede the production of certain plants (e.g. coca eradication plans, or the campaigns against opium; both are traditional plants opposed by the Western world). Although Szasz is skeptical about the merits of psychotropic medications, he favors the repeal of drug prohibition. "Because we have a free market in food, we can buy all the bacon, eggs, and ice cream we want and can afford. If we had a free market in drugs, we could similarly buy all the barbiturates, chloral hydrate, and morphine we want and could afford." Szasz argued that the prohibition and other legal restrictions on drugs are enforced not because of their lethality, but in a ritualistic aim. He also recalls that
pharmakos, the Greek root of pharmacology, originally meant "scapegoat". Szasz dubbed pharmacology "pharmacomythology" because of its inclusion of social practices in its studies, in particular through the inclusion of the category of "addictiveness" in its programs. "Addictiveness" is a social category, argued Szasz, and the use of drugs should be apprehended as a social ritual rather than exclusively as the act of ingesting a chemical substance. There are many ways of ingesting a chemical substance, or "drug" (which comes from pharmakos), just as there are many different cultural ways of eating or drinking. Thus, some cultures prohibit certain types of substances, which they call "taboo", while they make use of others in various types of ceremonies.