Weight gain after being sick?

I was sick for a few days with a sore throat and runny nose and a fever, and I didn't eat as much as I would.. I didn't exercise, I slept all day. I woke up yesterday and felt better, and looked in the mirror and it looked like I gained like 4 pounds? Then today I still have a bit of a sore throat and some body aches but I'm much better but the weight hasn't come off? Could this be water weight? I haven't really been drinking that much water when I was sick.
Weight gain after being sick?
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