Or what would that be called? Pretty much the same things that would usually be considered ableism, but when there’s not a recognised disability involved but just health issue/s (which could be “disabling”).
For example, not believing someone about their health issue, dismissing it or refusing to believe that it impacts their ability to function or can be a valid excuse for things (often solely on the basis that it’s not a recognised disability), blaming someone’s health issue on different things they aren’t caused by (and trying to attribute it to the person’s behaviour as if it’s their fault), and/or claiming that their opinions can’t be taken seriously due to their health problem
Would it be called health-based discrimination or something (despite somewhat mimicking the same mentalities as ableism)?
Are you asking regarding employment, or just in society at large? In the US, there are laws outlining what constitutes employment discrimination, and I don’t think you’ve given us enough detail to say more.
I’m curious what you mean by “not a recognized disability?” Recognized by whom? Someone with a health condition that impacts their ability to function in one or more life domains is certainly experiencing a disability