The pain on the right side of the chest above the breast is related to breast fibroma, breast hyperplasia and mastitis. First of all, when most patients have breast fibroids, they do not cause pain, but the fibroblasts in the lobules of the breast are more sensitive to estrogen, so an abnormal increase of estrogen in the body, or excessive stimulation of estrogen, will lead to pain at the site of the tumor. Secondly, women of childbearing age are prone to breast hyperplasia. Normally, hyperplasia lumps do not cause pain, but increased hormone levels in the pre-menstrual period will stimulate the lumps to proliferate, so it will cause localized pain, and a few women will show nipple pain and nipple overflow, and so on. Finally, acute mastitis can also cause chest pain, more likely to occur during breastfeeding, nipple injury will lead to bacterial invasion of the mammary ducts, milk clogging in the breast, will form a localized lump, in the dress or touch the lump, causing localized pain.