> diagnosed incorrectly This is a tough one, because mental illness is not generally well-understood. Yes, we have diagnostic criteria, but they're all quite f

> diagnosed incorrectly This is a tough one, because mental illness is not generally well-understood. Yes, we have diagnostic criteria, but they're all quite fuzzy, and very few kinds of mental illness take an obvious form like most physical illnesses. You can test for cancer and be certain; you can't test for depression or anxiety or PTSD or obsessive-compulsive disorder and be certain. Most mental illnesses exist on a continuum where, even if we could accurately identify their traits with any consistency, we would still be left to decide "are you depressed enough to be diagnosed?" I suppose in that sense, it's not unlike, say, prostate cancer, where the question is, "Is this bad enough to be worth treating?" But, generally speaking, you either have cancer or you don't; but with mental illness, there's no such binary, at least none that we've usefully identified for the vast, vast majority of forms of mental illness.