Could fibrocystic breast disease go away over time?

No: Fibrocystic disease is a termused when the breast as it ages develops lumps which is due to minizing of breast tissue with replacement by fat and the effect of estrogen on the terminal milk ducts which tend to plug the ducts near the nipple. The small amount of fluid in the ducts accumulates as cystic fluid spaces within the ducts further causing lumpiness or fibrocytic disease.