The causes of breast pain are primarily divided into physiological and pathological breast pain. Physiological breast pain is often caused by changes in the body's hormones, wearing inappropriate underwear, too tight bras, miscarriage, or hormonal changes before menstruation. This type of breast pain has a certain regularity and recurs cyclically; careful observation can usually identify the cause and solution on its own. Pathological breast pain refers to pain caused by breast diseases. The nature of the pain is diverse and irregular, constituting non-cyclical pain. Diseases that can cause this type of breast pain include mastitis, fibrocystic breast changes, breast trauma, or breast cancer. However, early-stage breast cancer generally does not cause noticeable pain; pain associated with breast cancer typically occurs in the later stages when the cancer affects nerves. Therefore, if you experience breast pain, do not rush to conclusions. Whether it is physiological, pathological, or induced by other diseases requires a doctor's diagnosis.