Pain in the location of underarm parastomia in the elderly may be caused by excessive exercise, changes in hormone levels, mammary hyperplasia, lobular hyperplasia of the breast and other factors. 1. Excessive exercise: if pulling heavy objects, it may lead to muscle strain in the area of the armpit attached to the breast, which is manifested as localized pain and discomfort. 2. Changes in hormone levels: as older people age, hormones in the body change and symptoms of paratesticular breast pain may occur. 3. Breast hyperplasia: due to endocrine dysfunction and other factors, patients with breast hyperplasia may experience paratesticular breast pain, breast nodules, breast pain, nipple overflow and other conditions. 4. Lobular hyperplasia of the breast: Lobular hyperplasia of the breast caused by changes in the level of sex hormones in the body and excessive fat intake, etc. Symptoms such as breast pain occur, but the pain will be easily radiated to the paratesticular breasts and the back and other parts of the body. Elderly people who have pain in the location of their underarm breasts should go to the hospital in time to find out the cause of the disease and then follow the doctor’s instructions for treatment.