Well, look, this thing will seriously screw with your head. I can't even count the number of times I have felt my nut and could have sworn that it was half the size it used to be, but then I wait a few minutes and all of a sudden it feels normal. It was probably the way it rolled in my fingers, or the way the epididymis was bunched up. Who knows?

That being said, this is your nutsack we're talking about. Anything that doesn't seem right to you should be checked out by a doctor.

I would respectfully dissent from the opinion that atrophy is, or can be, normal. Maybe it is (I am no doctor), but I cannot believe that seeing one's testicle shrink by 50% is not necessarily a serious situation. Shit, if my shirt shrinks in the wash, it sucks.