I'm making this post to shed some light on a topic which many women are sensitive about: having asymmetric breasts. Anisomastia means to have one breast larger than the other. It is far more common than you would imagine. The best I can estimate, about 1 in 3 of us show asymmetry. It can be very obvious - as for one woman who posted on reddit a couple of years ago who had one size A breast and the other size D. It can be almost invisible but can be felt as a slightly more "full" breast while the other is less full. Sometimes the only external sign of asymmetry is from milk production where one breast significantly outproduces the other. While I don't have research to show this, I have observational evidence it is inherited. One woman I know produces twice as much milk from her left breast as from her right. Her daughter has the same asymmetry. Anisomastia is not usually a problem when breastfeeding a baby though it may be associated with not being able to produce enough. I've watched posts here on ABF for 4 years. About as many report the right breast is smaller as report the left. In other words, it can be either side. Some research can be found which suggests the difference begins during gestation and shows up during puberty. The key takeaway is to not be ashamed or embarrassed over something that can't be changed very easily. My partner has anisomastia with one breast visibly a bit smaller than the other and producing more milk from the larger breast. I love her and love her breasts! She is perfect the way she is!

What can you do if you have anisomastia? Most can ignore it because it rarely affects daily life and usually can't be detected under clothing. For those who have severe asymmetry, a "boob job" can often help by making both breasts appear the same size. Discuss with a plastic surgeon if this is a concern.

I'm going to ask SqueakyLion to keep a close eye on this post. Please feel free to discuss the topic in a safe environment while Squeaky swats trolls.