Premenstrual syndrome (PMS) is one common cause of.
What causes breast swelling? A variety of things can cause breast swelling. The causes range from harmless to serious. Premenstrual.
This type of breast pain is usually limited to one breast. You may also experience: swelling; bruising; difficulty moving your arm or shoulder. Pectoral muscle.
Breast pain and swelling often follow a monthly pattern that's clearly connected to your menstrual cycle. This is known as cyclical breast pain.