#1 Finn Balor
One of the most worrying illnesses on this list os Finn Balor, the former Universal Champion was sent home from the South American tour earlier this week and wasn't part of Monday Night Raw the following night since the commentary team noted that he was dealing with injuries.
PWInsider later revealed that it was an illness that Balor was struggling with and that he will now have to be cleared to return to physical competition before Sunday night if his match with Drew McIntyre is given the green light.
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Balor was even replaced in the Mixed Match Challenge this week, which shows that WWE is taking this illness seriously, but many reports now suggest that The Demon King is expected to be cleared in time for the show so that he can continue his feud with Drew McIntyre on pay-per-view.