乳房缩小整形（reduction mammaplasty）是以切除部分乳房皮肤、乳腺组织，是乳房形体缩小和乳房位置改善，并进行乳头、乳晕整形一类整形技术。乳房缩小整形术是用于乳房过度发育及乳房下垂的整形术。

乳房的过度发育使乳房的体积过度增大，形成乳房肥大症（mammary hypertrophy，macromastia），俗称巨乳症。乳房肥大给女性带来精神上及肉体上的痛楚。

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乳房肥大可分为3类：乳腺过度增生性乳房肥大、肥胖型乳房肥大及青春型乳房肥大。由于病理及临床症状的区别，在治疗方法上也略有差别。

1、乳腺过度增生性乳房肥大 表现为乳腺组织过度增生，肥大的乳房坚实，乳腺小叶增生明显，常有压痛。在月经周期期间，常常有自发性疼痛，并伴有乳房下垂，较多发生于已婚育的妇女。

2、肥胖型乳房肥大 表现为整个乳房均称的肥大。在组织结构上，是以乳房中的脂肪匀称增生、脂肪细胞肥大为主；在手术中可发现乳房皮下有脂肪增生，在乳腺组织之间，也有脂肪增生及侵润。这类乳房肥大的患者常伴有全身性肥胖，肥大的乳房虽可能伴有不同程度的乳房下垂，但较乳腺过度增生性乳房肥大为轻。