Can the hormones in birth control pills cause increased under arm odor? i noticed it right after i went on them for the first time.

Anything is possible: I have never had a patient complain of that, the only thing you can do is stop that pill at the end of the month , not mid cycle, and try a different one with a differnet type of progesetrone, as that may be the cause as they all have the same type of estrogen, if the second pill does the same thing then u will need different form of birth control, but see your gyn to see what your gyn wants.