Breast swelling and pain one year after menopause may be caused by endocrine disorders, breast fibroids and breast cancer. 1. Endocrine disorders: After menopause, because of abnormal hormone levels in the body, endocrine dysfunction may cause stimulation of hyperplastic breast tissue, thus causing pain. 2. Breast fibroma: it is a benign tumor, most of which will not cause obvious clinical symptoms, but if the size of breast fibroma is relatively large, it will cause pressure on the muscles and nerve tissues around the breast, thus causing breast swelling and pain. 3. Breast cancer: Early stage mainly manifests as painless lumps, but as the disease progresses, it may lead to breast swelling and pain, accompanied by nipple discharge and other symptoms. Breast swelling and pain one year after menopause may also be caused by other reasons such as breast trauma, mastitis, etc. It is recommended to go to the hospital in time to clarify the cause and then target treatment.