Hello dear Understand your concern. I think it is due to hormonal changes. But it should be examined by surgeon or required picture for specific diagnosis. Following are the other cause Most common-Hormonal imbalance : High /lack of estrogen and progesterone It may be associate with Breast size, Excessive stress and Alcohol and caffine use, breast cystic disease You can do following test if remain long time: 1. Hormonal profile: LH, FSH, Prolactin, Estrogen, progesterone 2. Mammography You can take following Treatment before apperance of period 1. Life style cahnges - 30 min regular walk - Wear supportive pad bra - use of Ice pack - Relaxation excercise: breathing technique - Low fat diet - High fiber intake - Decreased salt intake - Multivitamin intake - Reduce alcohol and caffeine - Gentle massage with prime rose oil - Acupuncture therapy Hope this may help you. Best regards Dr. sagar