Although any lump formed by body cells may be referred to technically as a tumor. Following are examples of the most common benign breast conditions which produce lumps.
Fibrocystic changes are an exaggerated response of breast tissue to changes of ovarian hormones.
Fibrocystic changes are the most common non-cancerous breast condition. They are most common in women between the ages of 20 and 50. They are unusual after menopause unless a woman is taking hormones. The size and tenderness of Fibrocystic lumps usually increase before menstruation, decreasing after the period ends. This condition, also known as cystic mastitis, generally disappears after menopause.