Also called fibrocystic condition, fibrocystic change or cystic mastitis, fibrocystic breast disease is more a characteristic of the breast than a disease. It is often more prominent during ovulation and just before menstruation.

Fibrocystic changes occur during ovulation and just before menstruation. During these times, hormone level changes often cause the breast cells to retain fluid and develop into nodules or cysts (sacs filled with fluid), which feel like a lump when touched. The nodules...