Hello, Causes of pain in the breast are benign and not serious. There are a number of harmless causes for breast pain and tenderness that may primarily be related to changes in hormone levels. These can include menstruation and premenstrual syndrome (PMS), mastitis, menopause and fibrocystic breast tissue which is most common. Fibrocystic breasts are not necessarily linked to cancer, and the lumps are fluid-filled cysts rather than a mass of cells. However, it is advisable to do breast ultrasound and mammography just to be sure and start regular follow up of possible cysts. In case of redness, fever, and progressive pain this may indicate an abscess, and then it should be surgically drained or evacuated by needle under control of ultrasound. Hope I have answered your query. Let me know if I can assist you further. Regards,  Dr. Ivan R. Rommstein