Lately i have been noticing that my breasts are more tender than usual. what could this mean? i did a self exam and they seem normal just tender.

Mastalgia: Breast pain, also called mastalgia, is a common condition among women. According to California Pacific Medical Center, breast pain affects 50 to 70 percent of women (CPMC). The pain is usually categorized as either cyclical or noncyclical. Cyclical pain is associated with your menstrual cycle, whereas noncyclical pain is not. Pain linked with the menstrual cycle tends to lessen during or after your period. Noncyclical pain can have many causes, including injury to the breast. Sometimes noncyclical pain can come from surrounding muscles or tissues rather than the breast itself. Noncyclical pain is much less common than cyclical pain, and the causes can be harder to ascertain. Mastalgia can vary in intensity, from a sharp pain to a mild tingling. Some women may experience breast tenderness, or their breasts may feel fuller than usual.