I never had nausea, and only a couple instances of "growing pains". I used to have them a lot when I was a kid, but I've spoken to others who didn't know what the heck I was talking about, so that may be an indicator of whether or not you are likely to have them on T. For me, the worst side effects have been acne and much more frequent muscle cramps. Just had a nasty one in my thigh, a few minutes ago, as a matter of fact. Time to stock up on bananas again.