There are many reasons for pain on both sides of the breast, which can be seen in the following aspects: 1, breast injury, such as breast being squeezed or breast being hit, resulting in injury to the breast tissue, pain on both sides of the breast, in the absence of bleeding can be massage, physical therapy, but also paste the blood circulation ointment, there are wounds to pay attention to prevent infection, paste band-aid; 2, breast lymphadenitis, lymph nodes on both sides of the breast is stimulated The inflammation will be accompanied by breast pain, redness and swelling. Simple inflammation requires anti-inflammation, while lymph node metastasis caused by cancer requires anti-cancer treatment; 3. Unstable hormone level, breast swelling and pain will occur before or during menstruation, and will disappear after menstruation, if accompanied by breast enlargement, there will be movable hard lumps in the breast; 4. Breast cancer, breast pain will occur when cancer cells invade the nerves, which requires active hospitalization.