Hi heather1527, I started using Progesterone cream BECAUSE of breast pain
, so I know it didn't cause my pain
. I got pregnant w/ baby #7 right away, and so continued on the cream. The breast pain (left only) continued, but did not worsen. Now, that baby is almost 11 mos, and the pain is wearing on me. I feel a little relief during nursing, possibly since pressure is alleviated. I, too, worry about breast cancer. I've not gone for a check or ultrasound - I'm too afraid!