In its first year of use, complaints of pain, and even fainting, were higher than for other vaccinations.
The pain is short-lived, according to most girls. But some teens say it is uncomfortable driving with, or sleeping on the injected arm for up to a day after getting the shot.
Teens tend to faint from needles, so a three-dose vaccine for adolescents would be expected to prompt some added fainting.
Researchers aren't sure why terens faint more than other age groups, but nervousness may be a factor.
Merck, Gardasil's maker, says it does sting, partially because of the type of particles in it.
But doctors don't think the pain has diminished demand for the 3-injection vaccine.
