I've often read that we don't know a lot about certain illnesses because of poorly kept records (for instance, during the Middle Ages). Is it at all possible that future medicine has the same claims about current documenting efforts?

Sorry, but your submission has been removed because we don't allow hypothetical questions. If possible, please feel free to rephrase the question so that it does not call for such speculation, and resubmit Otherwise, this sort of thing is better suited for /r/HistoryWhatIf.

Although possibly, /r/AskScience might be the best place for this one.