There are many reasons for the vague pain on the right side of the breast, as follows: 1. Lymphitis. The lymph nodes will be affected by inflammation, painful and swollen performance, swollen lymph nodes can move, can be infusion of anti-inflammatory, larger need to remove surgery. 2, hysteria. Excessive mental stress or psychological stress will manifest itself as abnormal physical sensations, requiring relaxation, proper rest and psychological intervention. 3, breast injury. When the breast is squeezed or hit, resulting in damage to the breast tissue, breast pain will occur, which can be treated with massage and physiotherapy and, if necessary, with blood-stasis-boosting medicine. 4. The hard lumps of patients with breast enlargement will be painful and swollen before and during menstruation, which can be left untreated if the pain is not obvious, and need to take prolotherapy pills if it is obvious. 5. Patients with breast cancer will have pain when the cancer cells invade the nerves, which requires surgery and chemotherapy at the same time.