How Common is Breast Asymmetry Among Women?

Hello, I am trying to find out what is the percentage of women who have asymmetric breasts and what would be the average difference in breast size for women? I have right one size C cup and left one size B cup. I would appreciate your help. Thank you.

Doctor Answers 13


This is very normal.  Most women have asymmetric breasts before and after breast surgery.  They are sisters not twins.  

In addition, Temporary asymmetry is quite common after breast augmentation.  For one thing, most patients have asymmetry before surgery but just never notice it, and maybe their plastic surgeon never noticed it.  If you look back at your before pictures you may notice it now.  So with a breast augmentation, your breasts will be fuller and larger but they are still going to have some of that inherent breast asymmetry.  A breast augmentation can not change the nipple position, the width of the breast, the level of the crease etc.  This requires more advanced techniques like a mastopexy or revision which often requires more scars on the breast.  So your breasts will be sisters, not twins afterwards.  That being said, sometimes we will place two different size implants if the discrepancy is substantial enough to at least try to correct some of the difference between the two breasts...but again this is not going to make them twins.  In addition, implants tend to settle and sit in the pocket differently.  So one breast might seem lower and smaller, or lower and larger depending on the rate of settling.  I typically recommend patients wait a full 3 months before we critically assess the results and begin having any discussions about a revision surgery.  

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"The above answer has been given without seeing this patient and cannot be substituted for actual in-person examination and medical advice; it is only opinion. Seek in-person treatment with a trained medical professional for appropriate care."

Atlanta Plastic Surgeon
5.0 out of 5 stars 26 reviews

Breast Asymmetry options

Thank you for your question. Breast asymmetry is very common, particularly size asymmetry. If you are looking to decrease the asymmetry from one breast to another, then you have several options.
1) You can reduce the larger breast with liposuction
2) You can enlarge the smaller one with fat grafting or an implant
3) You can enlarge both but use different size implants
I would visit with a board certified plastic surgeon to discuss your options in more detail.

Young R. Cho, MD, PhD
Houston Plastic Surgeon
4.8 out of 5 stars 37 reviews

Every woman's breasts are asymmetrical to some extent

Every woman's breasts are asymmetrical, but it is a matter of being able to detect the asymmetry. Some women have just minor differences that can't even be measured by cup size, while others have a difference of several cup sizes (e.g. left is an A and the right is a C). It sounds like you have asymmetry that isn't as severe and most likely quite common. 

Jerome Edelstein, MD
Toronto Plastic Surgeon
5.0 out of 5 stars 176 reviews

Breast Asymmetry is Extremely Common

Thank you for your question. Most women actually have some degree of breast asymmetry. I do not know offhand the percentage exactly. If your breast asymmetry bothers you, you might be well served by a breast augmentation. For augmentation, I would not want to place a single implant on one side, but it is common to place breast implants of different sizes in the left versus right breast. Another option would be a breast reduction.

Joshua D. Zuckerman, MD, FACS
New York Plastic Surgeon
5.0 out of 5 stars 22 reviews

The majority of women, to some degree.

The vast majority of women have some degree of breast asymmetry.This asymmetry occurs for a variety of reasons.It can be related the volume of the breasts or, in some cases, to the shape of the breasts.In some cases, asymmetry may be related to the position of the nipple areola complexes, while, in other cases, it may be related to deformities of the underlying chest wall.
Regardless of the cause, a cup size difference isn’t an unusual finding.When this problem is encountered, a variety of surgical options are available to treat the problem.
If you’re concerned about breast asymmetry, it’s important to consult a board certified plastic surgeon.This surgeon should be able to formulate a treatment plan that addresses your concerns.

Richard J. Bruneteau, MD
Omaha Plastic Surgeon
4.9 out of 5 stars 194 reviews

Breast asymmetry

Some degree of asymmetry is almost universal, although it is uncommon to have enough asymmetry to warrant differential implants. Since you have a cup size difference between the two sides, you would benefit from differential implants. This would go a long ways towards a visually similar result. They may not be exactly the same, but with more volume, perceived differences in the breasts will lessen.

Ben Lee, MD
Denver Plastic Surgeon
4.5 out of 5 stars 25 reviews

Extremely Common

Asymmetry is definitely the norm for women. One breast is always different in shape or size than the other. The only problem is when the asymmetry is very apparent, which could cause embarrassment for the woman affected. You can get breast augmentation or a reduction surgery to balance out your breasts.

Michael Constantin Gartner, DO
Paramus Plastic Surgeon
4.7 out of 5 stars 137 reviews

Breast asymmetry among women is much more common than perfect breast symmetry

Thank you for your question. I cannot give you a proven percentage of women with significant breast asymmetry based on controlled clinical studies. I can tell you that one cup size breast asymmetry is quite common in the normal population of people. In 31 years of practicing plastic surgery I don't believe I have ever seen perfectly symmetrical breasts. One cup breast asymmetry can often be corrected with a lift on the larger side and if enlargement is desired breast implants on both sides.There is an example of correction of asymmetry on the last patient photograph in the attached article on breast implants for tuberous breast deformity

Breast asymmetry is common

Most patients have some degree of breast asymmetry, although asymmetry of one or more cup sizes is less common.  There are many options to correct the asymmetry you have described including enlarging the smaller breast only with an implant, enlarging both breasts with different size implants, and reducing the larger breast.  Your board-certified plastic surgeon will explain your options, and help you decide on the procedure of choice for you.

Andrew P. Giacobbe, MD
Buffalo Plastic Surgeon
4.9 out of 5 stars 23 reviews

Breast asymmetry is common

Breast asymmetry is incredibly common because the body is not symmetrical. The degree of asymmetry you refer to, C on one side and B on the other, is regularly seen. See a plastic surgeon who can explain the options for reduction of the larger breast, augmentation of the smaller one, or a combined approach as there is more than one way to handle this issue, depending on your preferences.

Robert L. Kraft, MD, FACS
New York Plastic Surgeon
5.0 out of 5 stars 41 reviews

These answers are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.