For most people, breasts are not completely symmetrical and do not need to be overly concerned if they do not affect the aesthetics and have no abnormal performance. If there are disease factors that cause breast asymmetry, timely and systematic treatment is needed according to the different causes; if it only affects aesthetics, individuals can consider surgical correction when they have the need for improvement. Physiological causes: 1, congenital development problems: in the development process due to clothing, bad posture, etc. can lead to breast asymmetry, expressed as inconsistent breast size, if the difference between the two breasts is small generally do not require special treatment. If the difference between the two breasts is too large, in adulthood can also be corrected by breast filling surgery; 2, uneven breastfeeding: in women breastfeeding, because the frequency of breastfeeding on both sides is inconsistent or the milk is not completely sucked clean, etc., can cause breast asymmetry, which is generally normal, it is recommended that both sides alternate breastfeeding, and each time after the breast is empty and then change to the other side; 3, the impact of sports: long-term sports posture and force asymmetry, such as the use of excessive unilateral arm. Such as unilateral arm use too much, causing asymmetric increase in chest muscle volume, thus causing breast asymmetry, you can try to change bad exercise habits, such as symmetrical exercise on both sides, can alleviate the situation of breast asymmetry to a certain extent. Second, the pathological reasons: 1, trauma: trauma can cause local breast enlargement, so that the two sides of the breast asymmetry, generally in the trauma can recover after healing, but the resulting scars can continue to affect the breast symmetry, serious cases may require surgery to correct; 2, breast inflammation: pathogenic bacteria into the breast or infection of the breast skin can cause local redness, swelling, pain, causing breast asymmetry, you can use antibiotics such as penicillin The occurrence of abscesses requires incision and drainage to drain the pus, and breast asymmetry can be improved after the swelling is relieved; 3, hormonal abnormalities: unilateral breast diseases caused by hormonal abnormalities such as mastocytosis and gigantomastia may change the size of the affected breast, forming nodules and lumps, resulting in breast asymmetry, which can be relieved by using hormonal drug therapy, and if treatment effect is limited, you can also choose local surgical excision, symmetric correction of the breast; 4, developmental deformities: breast, chest and other muscle development deformities, dysplasia, may lead to both sides of the breast asymmetry, generally can be repaired through breast surgery, breast deformities; 5, the impact of mastectomy: suffering from breast cancer and other breast tumor disease, in the surgical treatment may need to remove one side of the breast or part of the breast tissue, resulting in breast asymmetry, can be modified by surgical placement of prosthesis, etc.