‘Understanding the Fibrocystic Breast Tissue,’ by Dr. Tory Hudson:

Fibrocystic breast disease is a condition in which there is lumpiness in one or both breasts. The lumps are caused by benign cysts, also known as tender areas of thickened tissue, and sometimes produce swelling, pain, and sensitivity of the breasts.

http://drtorihudson.com/articles/natural-approaches-to-fibrocystic-breasts/