No idea if this is actually true but I’ve always been told flu hits like a ton of bricks with no warning unlike say a cold where you feel like you might be getting sick for a day or two until you do. The one time I had flu this was true for me - felt fine, got to work and suddenly felt terrible. Made it through the day but barely and then was in bed for a week. About as sick as I’ve ever been - and I’ve mostly gotten flu shots ever since, even before it was really a thing (I was in my 30’s at the time). Knock wood haven’t had flu since, at least that I know of and if I did it was mild.
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