Normal human organs are symmetrically distributed, the mammary gland is an adult female sex organ, located in the superficial surface of the pectoralis major muscle, most of the symmetrical growth, the reasons are as follows: 1, due to individual differences in the right side of the slightly higher than the left side, if there are no uncomfortable symptoms, it is considered to be a normal situation; 2, the more common reason is scoliosis, sternal rib deformity, the whole body to one side, the height of the mammary gland Different, need to go to the hospital to take pictures; 3, due to breast dysplasia appeared on one side of the poor development of the mammary glands, resulting in unevenness, puberty development will gradually improve after the end of no special drugs can be treated; 4, one side of the breast has a lump can lead to the height of the two sides of the different, palpation self-check or color ultrasound examination can be diagnosed. In either case, it is recommended to go to a regular hospital for consultation before treatment.