Researchers say one in three women with breast cancer detected by a mammogram receive unnecessary treatment.
The chief medical officer of the American Cancer Society said some women are actually harmed by surgery, radiation and chemotherapy for tumors that would have been essentially harmless.
He compared every small breast legion will turn deadly to racial profiling - some experts event call it over-diagnosis.
While mammograms do help detect cancer early, medical professionals say women should know the risk.
