The vaccine, though come to think of it, I haven't seen a gyno for ..uh... entirely too long.
Not really like the tetanus shot.... it burns during injection at the site, and down the arm. Apparently it is because of the silver carrying solution they use. When I got the first shot I got occastional burning sensations and twinges in my wrist and hand for the rest of the day, but the other two only hurt during the injection. In that sense it is better than the tetanus shot which makes your arm hurt for days afterwards! While not pleasent, it is really not that bad, and I am willing to put up with a little pain to (hopefully) protect myself from cancer, especially since my Mom had cervical cancer!