While plastic surgeons and oncologists aggressively promote breast reconstruction as a way for women to “feel whole again,” some doctors say they are beginning to see resistance to the surgery. Patients like Ms. Bowers are choosing to defy medical advice and social convention and remain breastless after breast cancer. They even have a name for the decision to skip reconstruction: They call it “going flat.”

“Reconstruction is not a simple process,” said Dr. Deanna J. Attai, a breast surgeon in Burbank, Calif., and a past president of the American Society of Breast Surgeons, adding that more of her patients, especially those with smaller breasts before diagnosis, were opting out of reconstruction. “Some women just feel like it’s too much: It’s too involved, there are too many steps, it’s too long a process.”