I've always had an extremely high pain tolerance. I think my tolerance is partly due to my extreme self-consciousness: I feel like a wimp when I'm in pain and I don't want to inconvenience anyone, so I just suck it up. I also had an experience when I was a kid when my folks thought I had appendicitis. The diagnosis at the ER: trapped gas. I was perhaps 6 or 7 at the time, but I was embarrassed that it was no big deal and I knew it was a costly trip. That moment is ingrained in my psyche, so whenever I'm in pain, I wait it out.
I've had a few moments where I complained about pain and friends thought it was nothing to worry about. But experiences with gallstones, ovarian cysts, displaced pelvis, etc, hy friends and family have finally learned that if I'm in tears, it's ER time.
And in all honesty, I get some pleasure from pain. Not as in "a broken arm gives me an orgasm" pleasure, but I dunno... it's a refreshing experience sometimes. It can bring attention to the most finite parts of the body. I don't seek out pain--though my boyfriend is catching on that I like pinches, bites and rougher sex sometimes--but I also don't usually resolve pain with painkillers and other healing methods.