When You Should Get a Mammogram: Weighing the Pros and Cons of Starting Early

Sandra Lee was diagnosed with breast cancer at 48 years old.

Different organizations offer different recommendations when it comes to mammograms, but that can get confusing.

USPSTF doesn't deny that patients die of breast cancers in their 40s, but it says mammography benefits don't outweigh the harms. The potential harms of mammography include stress, unnecessary additional imaging, unnecessary biopsies and unnecessary treatment for cancers that wouldn't end up killing the patient, said Dr. Donna Plecha, director of breast imaging at U.H. Case Medical Center in Cleveland, Ohio.

"Other people say, 'No that's not a harm to me. You're being thorough,'" Plecha told ABC News. "It really depends on your point of view."

"I think mammography saves lives," she said.

Plecha said of every 1,000 people who undergo a mammogram, on average, 900 will have negative results and 100 will be recalled for additional tests. Of those, 26 will be asked to return in 6 months and 19 will need biopsies. Between five and eight of these patients will be diagnosed with breast cancer, Plecha said.

Ashton said patients should work with their doctors to determine what's best for them.

"Medicine is not 'one-size-fits-all' and this is no different," Ashton said. "Each woman is an individual and her risk needs to be assessed by her health care provider so that the best course of action for her can be determined. There is no such thing as a perfect screening test, but rather today, different approaches for women based on their age, family history and personal risk factors."