Natural Breasts

• Natural breasts are almost never symmetrical. One is almost always bigger than the other. A large difference such as a B-cup and a DD-cup can be remedied with surgery or by wearing padding on the smaller side.
  
  

Breastfeeding

• During breastfeeding, it is normal for one breast to seem fuller or larger than the other. If baby favors one side, it will fill up more than the other. After weaning, breasts should return to similar sizes.
  
  

Breast-Augmentation Surgery

• After breast-implant surgery, it is normal for one breast to swell more than the other. If after four months, there is still a noticeable size difference, see your plastic surgeon to find out what is wrong.
  
  

Sudden Change

• A sudden change in the size and shape of one or both breasts can indicate breast cancer. See a doctor immediately if either breast suddenly seems larger than normal.
  
  

Breast Implants

• Breast implants can break down, leak or rupture. If you have implants and one breast suddenly seems smaller than the other, see your plastic surgeon immediately to find out what has happened.