Elderly breast enlargement, the common clinical causes are obesity, breast fibroid, breast hyperplasia and so on. 1. Obesity: This is a chronic metabolic disease, related to genetic, environmental and other factors, the fat in the body of the sick people accumulates excessively and causes obesity and overweight. Part of the population is prone to fat accumulation in their breasts and buttocks, which is manifested as breast enlargement. 2. Breast fibroma: This condition refers to a common benign breast disease, usually associated with the abnormal sensitivity of breast fibroblasts to estrogen, clinically manifested as a movable, painless breast lump, if the size of the lump is large, it may make the breast size increase accordingly. 3. Mammary hyperplasia: this condition refers to a benign breast disease caused by the malfunction of normal development and degeneration process of the mammary gland, the cause of which is the disturbance of the normal structure of the mammary gland caused by mammary hyperplasia, with clinical manifestations such as breast pain, nodules or lumps, and part of the population also has nipple fluid overflow. Elderly breast enlargement should also be considered malignant diseases, need to actively consult the doctor, clear cause for targeted treatment.