What causes fibrocystic breast changes is not understood. Some studies have linked diets high in caffeine, cola, or chocolate with increased risk of pain associated with fibrocystic breasts.
Although some breast lumps are cancerous, most — 80 to 85 percent — are benign. In addition to fluid-filled cysts, fibroadenomas (benign tumors), infections, and injuries are other common causes of breast lumps.
Breast pain that is not associated with the menstrual cycle is called noncyclical breast pain. It can occur at any time and at any age and is usually associated with injuries, such as thoracic radiculopathy (an injury to the nerves near the breast) and costochondritis (an inflammation of the breastbone), as well as with medications such as hormone replacement therapy and diet.
Nearly 85 percent of all women with breast pain respond to nonmedical treatment. Others may need medication. Treatment includes: