Breast atrophy refers to the reduction in size of the breast tissue. There are several synonyms to describe this medical condition. Some of these synonyms include mammary gland atrophy, glandular atrophy of the breast, and involutional hypoplasia of the breast. Another term used to describe breast atrophy is involutional mammary hypoplasia. Breast atrophy can occur due to various reasons such as hormonal imbalances, aging, pregnancy, breastfeeding, and genetics. It is commonly associated with postmenopausal women. Breast atrophy can affect a woman's physical appearance and may cause emotional distress. It can be treated using various methods like hormone replacement therapy, breast augmentation, and fat transfer.