Mastopoiesis is a clinical condition in which the ratio of androgen to estrogen is imbalanced due to physiological or pathological factors, leading to abnormal development of breast tissue and hyperplasia of connective tissue of the mammary glands. 1. Clinical manifestations: It usually manifests as painless progressive enlargement of one or both breasts, or the appearance of painful lumps in the area under the areola. 2. Treatment: Commonly used treatments include medication and surgery, including tamoxifen, clomiphene, etc. Surgery is used for those who are ineffective in medication, at the end of puberty, those who still have breast development even after puberty, and those who have malignant lesions in the mammary glands. Such as mastectomy of the breast gland. Therefore, patients with breast development disorder should actively consult the doctor for early treatment, so as not to delay the condition and affect the patient’s prognosis.