I think you have it backwards – chronic illnesses are, by definition, the ones we can’t cure. There isn’t going to be one answer to *why*, since the ones you listed affect different systems in different ways.
I think a lot of the time it’s easier to fight against a single problem that occurs once, like most diseases, but chronic illnesses are also things that stick around and thus have an ongoing cause. So like, a vital infection is one external invader that you can kill, but a hormonal balance problem? A problem with how your nerves are signaling? Those are problems that are hard to get to the root of.
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