How does left breast ache return a responsibility

There are three reasons for left breast pain: First, cystic hyperplasia of breast disease, also known as breast disease, more common in middle-aged women, more common in women between the ages of 20 and 40, generally speaking, one is due to sexual hormone metabolism disorders in the body, especially estrogen, progesterone imbalance, so that breast hyperplasia and incomplete involution, manifested as one or both breast pain and mass formation, with periodicity, breast pain is generally relatively mild, obvious before menstruation, weakened or disappeared after menstruation, positive color Doppler ultrasound examination, Can be clearly diagnosed, second, consider more acute mastitis, acute mastitis is more common in lactating women, mostly due to milk stasis, bacterial retrograde infection caused by pain is more obvious, manifested as unilateral breast redness, swelling, heat, pain and severe pain when breastfeeding, this situation needs to be actively given anti-infection treatment, third, breast no obvious pain, but only one side armpit or shoulder back pain, there is also the possibility of malignant lesions, These subtle changes should not be let go easily.