I know this will sound a little odd, but I'm being quite serious... For some reason, in the past month or so, my right armpit has begun to sweat really heavily. My t-shirt will get wet within an hour after I apply anti-perspirant, and it soaks through to my shirt quickly after that. I have no idea why this is suddenly happening; I've never had this problem before. I use Aveda anti-perspirant, which is actually pretty powerful, and has always worked in the past. I haven't changed my diet, and my weight hasn't fluctuated (I am 6'2", 210, and pretty fit). The only major lifestyle change I have made of late is that I have cut my alcohol intake by about half, but I can't see why that would be a factor. Any ideas?