Is It Normal for One Breast to Droop and One Not?

I think photos should help. Also, when was your surgery?  Your left and right side of body (including chest/breasts) may be slightly asymmetric.  One side muscle may be tighter; one side chest may be narrower.  It is normal to have different rate of "dropping."  You may be slightly asymmetric if you were asymmetric prior to surgery.  If it has been more than 3 months since your surgery and you see a significant difference, you should see your plastic surgeon to be examined. 

Dear pooky50, breasts can be very different one from the other and still be normal.  By normal I mean that they function normally producing milk and they carrie no diseases.  Now when the breasts are different in size or shape it is called asymmetry.  A little asymmetry is easily tolerated or ignored, in fact, it's very difficult to find a woman with perfectly symmetrical breasts.  When the asymmetry is noticeable it becomes a source of discomfort, distress or embarrassment to the point where some women will seek correction by surgical means.  I find the correction of asymmetry via plastic surgery to be very challenging because breasts are different not only in volume but also in shape, length, position and size of the nipples, etc.  That is why correction of asymmetry needs to be individualized to each particular case and it generally involves various forms of lifts, reductions and even the use of implants.  Seek the help of an experienced Board Certified Plastic Surgeon and good luck with your choice. DrBrou