Stigma

Dictionary definition of stigma:
1. A mark of disgrace or infamy; as on one reputation.
Medical:
2. A mental or physical mark that is characteristic or a defect or disease.

Disgrace, infamy, is that what we think of when referring to mental illness being "stigmatized"? No, rather it is presented in the form of "ignorance". "Mental illness is stigmatized because people are ignorant of it's forms and symptoms".

The word "stigma" in it's current usage is actually a euphemism for "shame". We (the general feeling) feel SHAME for anyone with mental illness, but don't have the courage to say it as such.
In fact, the current use of the word "stigma" even subtly suggests that the "stigmatized" (IE. Mentally Ill person) is at fault. "Others don't understand you, but you're the one who needs change". What about these "others who don't understand" educating themselves!

I don't understand what diabetics, or cancer patients go through on a daily basis, does that make them "stigmatized", or me ignorant? The same applies to mental illness, when someone does not understand it, the sufferer is not "stigmatized", the first person is simply ignorant. So just as it is up to me to educate myself about diabetes and cancer, it is up to them to educate themselves about mental illness.

Reality is that mental illness is still seen as shameful. Like most everything else in today's world, people have come up with softer terms (in this case "stigma") in order to make unacceptable beliefs acceptable.