Breast swelling and pain in 70+ year olds can be related to mastitis, breast cancer, breast cysts, and so on. 1. Mastitis: Mastitis is an inflammation of the breast tissue with or without microbial infection, and it is divided into lactation mastitis and non-lactation mastitis. 70-year-olds with breast pain can be considered non-lactation mastitis, and the causes include blocked milk ducts, a history of smoking, nipple inversion, and bacterial infection. 2. Breast cancer: Breast cancer is the uncontrolled proliferation of epithelial cells in the breast, which leads to malignant changes. Causes of breast cancer include early age of menarche, late age of menopause, infertility and late age of first childbearing, and short breastfeeding time. Symptoms of breast cancer include breast lump, breast skin abnormality, nipple or areola abnormality, nipple discharge, pain and so on. 3. Breast cyst: It may also be the swelling and pain in the breast caused by the accumulation of fluid in the breast of elderly people in their 70s. The cause of the disease is still unclear, and it may be triggered by breast hyperplasia or abnormal structure of the breast ducts. Generally there are no obvious symptoms, but if secondary infection may occur after acute inflammation. It is not excluded that herpes zoster or cardiothoracic diseases and other factors triggered, the 70-year-old man appeared this phenomenon, but also need to go to the hospital for relevant examination, for the cause of the treatment.