Ok, so I went on a 10 day climbing trip (a lot of bouldering involved) and got back about a week ago. I hadn't noticed anything hurting (and I've never had any climbing related injuries), and then my hand seemed to spontaneously start hurting. I'll try to describe where it hurts the best I can: if you open your hand and draw a line from your pointer finger down towards your wrist, and then draw a line from your thumb down towards your wrist, the pain is coming from the intersection of the two lines. It hurts when I'm doing a pinch, or more specifically when I'm unlocking my front door (so pinching and twisting). Like I said, I don't remember any specific move I did for it to start hurting like this, so if it is climbing related I'm guessing it's more of an overuse thing. Any ideas what I've done?

I had something similar happen while bouldering about 9 months ago. It felt to me like a strained tendon. I layed off it for about two weeks, then did light bouldering with no pinching and worked back from there... hope that helps :)