I have pcos. i've been takeing prenatal vitamins and fish oil. can the prenatal vitamins make my breast sore?

No: Prenatal vitamins do not cause breast tenderness, changes in hormone levels like estrogen lead to this. If persists and not controlled then see your doctor for further eval.

Negative: Prenatal vitamins are just an extra helping of vegetables and fruits with supplemental Folic Acid (just another b vitamin). However, your changing cyclical hormone levels could make your breasts sore.

I very much doubt it: But might not be impossible. If breast pain continues, i'd see a doctor to look for another cause.