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Is It Normal to Have Different-Sized Breasts?

In this video, an ob-gyn talks about uneven breasts and what causes breasts to be different sizes.

Mera Goodman, MD
Written by Brittany Doohan | Reviewed by Mera Goodman, MD
Updated on January 12, 2021

Every set of breasts are as unique as the women who carry them. They come in all shapes, sizes, and colors. You may have discovered, though, that there are even minor (or major) differences between the two breasts on your own chest. Is it normal to have breasts in different sizes?

Is it normal for breasts to be different sizes?

Yes, it's normal, and it affects more than half of all women. Breast asymmetry is defined as a difference in form, position, or volume of the breast. In fact, your entire body is technically asymmetrical. One side of your body is completely different than the other (although it’s not usually obvious to the human eye).

You might have different sized hands, feet, eyes, ears, and more. Your two breasts may be vary in size up to a cup.

Generally, slight differences in a woman’s breast size are not a concern. Some key differences, though, could signal a problem. Possible concerns include:

  • Scoliosis

  • Breast cancer

If you notice any new or unfamiliar changes to your breast, it’s always wise to call your doctor. Possible signs of breast cancer include nipple retraction, breast dimpling, or a palpable mass or irregularity.

Why are my breasts changing?

Alongside your breasts being perfectly mismatched, they can also fluctuate in size over time. This usually happens because of:

  • Hormonal changes, such as throughout the menstrual cycle

  • Pregnancy

  • Breastfeeding

For example, your breasts may feel fuller and more sensitive when you’re ovulating. They might also get bigger from water retention and blood flow.

What can I do about uneven breasts?

Bras to fit uneven breasts aren't yet a mainstream product, so most women make do by buying a bra size that fits the larger breast.

If your uneven breasts are causing distress or affecting your quality of life, you do have options. Some people choose to have breast reduction surgery on the larger breast, or they might choose to have an implant on the smaller breast. As with any surgery, these procedures may come with risks. Talk to your doctor about the risks and benefits of the procedure for you to learn more.

Additional Medical Contributors
  • Jennifer Wu, MDDr. Wu is a board-certified obstetrician-gynecologist practicing in New York City.
    View All References (1)

    Breast Cancer Signs and Symptoms. American Cancer Society. (Accessed on January 10, 2021 at https://www.cancer.org/cancer/breast-cancer/about/breast-cancer-signs-and-symptoms.html)

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