To my knowledge, there is no data to support this assertion, so it's meerly speculation. Nevertheless, I would not agree that introverts, or feelers are more predisposed to mental illnesses. That said, I would not be shocked if some types are more likely to be afflicted with some mental illnesses over others.
As for mental illnesses causing someone to be mistyped? I would say it's certainly possible. Likely happens all the time actually.
MBTI: ExxJ tetramer Functions: Fe > Te > Ni > Se > Si > Ti > Fi > Ne
Enneagram: 1w2 - 3w4 - 6w5 (The Taskmaster) | sp/so Socionics: β-E dimer | - Big 5: slOaI Temperament: Choleric/Melancholic Alignment: Lawful Neutral External Perception:Nohari and Johari
It's just speculation,course. Suppose an ENFP is a hoarder, he/she may appear to be too attached to sensory things. Not all hoarders are the same personality type,but it might cause them to be mistyped. e.g. schizophrenics may be typed as mostly being N types. I've seen a lot of material related to celebrity MBTI types, but not much related to the spectra of mental illness, like OCD, MPD, borderline personality disorder etc.
That which does not kill me, improves my looks. - Michael Jackson
I don't see why it couldn't if you think about it drug use mimics certain mental illnesses and while under the influence people will appear to be a different type. I think that same could be said about untreated mental illness. A lot of people are going to say no on here, but I disagree
Sure: if one isn’t in the right frame of mind, identifying one’s most inherent tendencies might lower in accuracy for some. However, Neuroticism (Big Five) positively relates to mental illness (on the high end: family dissatisfaction, abuse, lack of occupational commitment, antisocial behavior, etc.). There is extensive research on this… as well as Extraversion, Openness, Agreeableness and Conscientiousness being positively related to health, interpersonal relationships (not always for Openness, although there aren’t bad outcomes here either) and career performance success. One of the strongest personality papers indicates that these personality facets might be better predictors of life outcomes than SES and cognitive ability (although these are influential as well).