Other then pregnancy, what can cause excessively tender nipples? I have been losing weight and noticed my breast size was increasing NOT decreasing as I expected, so of course I immediately wondered if I was pregnant, however, I have had sex once in the past 3 months, had my period two weeks ago (the intercourse occured in November), and the past week my nipples have been painful to touch, rub etc. This is incredibly odd as I normally dont have any sensation in them at all, even if they're being played with. Of course, I return to the pregnancy idea, but its just not possible, and I've also been on birth control since I was 15, the exact same type of pill, with no more then a month off 2 years ago when I was between doctors. So, any help? Im thinking of getting a mammogram just to ease my fears that it might be cancer or something.