I had an HSG with no type of anesthesia and it was fine, it felt like menstrual cramps but it was overall no big deal at all. In contrast, I had an endometrial biopsy done which my OB told me should be no big deal at all and that most women say the HSG is worse - and I couldn't even tolerate it, they had to stop the procedure before the catheter even got in because I was screaming. So not sure what the difference there was! But rest assured, I'm obviously a wimp with that kind of stuff and the HSG was nothing.