I'm very stubborn when it comes to injuries, and as it is now, I've been taking this week off from lifting due to a leg injury. I always go and lift when injured, I try to not let anything stop me from going to the gym and usually I just end up making it worse.
Three weeks ago I injured my knee wrestling, turned out it was on leg day so what do I do? Go and do squats and leg presses, I actually collapsed while doing squats because I went too heavy and my knee gave out, luckily I had someone spotting me because I had a lot of weight on the bar. Ended up barely able to walk for 3 days after.
Then this past weekend, I had a pulled calf muscle, once again it came around leg day. So the next day I go and do legs, doing the usual: squats, leg presses, calf presses, extensions and leg curls. Didn't collapse during squats, got through all my sets fine, it actually didn't really even hurt, just a little tight. But my lifting definitely aggravated it, as the next 2 days I can barely walk... again. So this week I've been taking off from lifting. My calf is still a little weak, but it's getting better.