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Narcissistic personality disorder or antisocial personality disorder would be candidates.
There is no set length of time. It would depend on the severity and specific disorder and on the person treating that disorder.
Hospitalization would be recommended for anyone whose mental disorder is so severe that the person in question is dangerous to himself or others.
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Chromosomal, because the person with Klinefelter's would have 47 chromosomes. A genetic disorder would be any disorder having to do with genes, but would not necessarily mean having an extra chromosome.
No because sometimes you have to speak in third person. If you always speak in third person, maybe. If someone speaks about him/herself in the third person ("he" or "she" or their name) instead of the first person ("I"), this in itself cannot be used to diagnose a personality disorder. There could be several reasons why they do it and contexts in which they do it that would not be unusual. (Examples: a parent who is used to speaking that way to a toddler; someone who does it consciously to be humorous or to deliberately distance himself from something upsetting.) However, in the presence of other signs and symptoms, it could indicate dissociation (which may be a temporary reaction and not a permanent disorder).
The person's body would be unable to maintain homeostasis, and her body temperature would rise dangerously high.
It can be. There is a disorder called PICA where non-food objects are compulsively eaten. If a person does it only once or twice, then it would not be considered a disorder. If it is a compulsion then medical intervention should be sought out.
Yes.
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Many reasons- you could have eaten an onion, you could have not brushed your teeth, or you could have a disorder that features bad breath.
Multipersonality is not a recognized psychological term. It may be a misunderstanding or misinterpretation of dissociative identity disorder (DID), in which an individual experiences two or more distinct and separate identities or personality states that control their behavior. This condition is rare and often the result of severe trauma or abuse.