Breast pain (mastodynia) alone is not significant for breast cancer. Breast cancer is an insidious disease and usually does not cause pain. The most common cause of pain, ache and tension felt in the breast is hormonal changes. In women with fibrocystic changes, the feeling of pain felt due to hormonal changes may be more pronounced. Especially before menstruation, the feeling of pain and tension due to the increase in hormones becomes more evident. It is rare for breast cancer to cause pain, but some advanced breast cancers may cause pain.