Mammograms are good at finding lumps, but it can be hard to determine which could become life-threatening and which are harmless. Damian Dovarganes/AP hide caption

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Damian Dovarganes/AP

Danish Study Raises More Questions About Mammograms' Message

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Following up a mammogram with an ultrasound exam can find more cancers. But the additional test can also find more false positives that aren't cancer at all. F. Astier/Centre Hospitalier Regional/Science Source hide caption

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F. Astier/Centre Hospitalier Regional/Science Source

After a Cologuard screening test for colon cancer comes back positive, patients may have to pay for additional diagnostic tests. Exact Sciences hide caption

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Exact Sciences

Lipitor (atorvastain calcium) tablets made by Pfizer. PAUL J. RICHARDS/AFP/Getty Images hide caption

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PAUL J. RICHARDS/AFP/Getty Images

What To Think About Conflicting Medical Guidelines

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Testing for prostate cancer has declined after a recommendation in 2012 said it shouldn't be routine. iStockphoto hide caption

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iStockphoto

Prostate Screening Drops Sharply, And So Do Cancer Cases

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The American Cancer Society has pushed back the age at which most women should begin having mammograms to 45. iStockphoto hide caption

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Cancer Group Now Says Most Mammograms Can Wait Till 45

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Although false alarms are not at all unusual when it comes to mammograms, they can cause women much anxiety. Doctors are thinking about ways to ease those fears. iStockphoto hide caption

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iStockphoto

Dr. George Papanicolaou discovered that it was possible to detect cancer by inspecting cervical cells. The Pap smear, the cervical cancer screening test, is named after him. American Cancer Society/AP hide caption

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American Cancer Society/AP

Catharine Becker of Fullerton, Calif., was diagnosed with stage 3 breast cancer at 43 despite having a clean mammogram. The mother of three didn't know she had dense breast tissue until after she was diagnosed. Heidi de Marco/Kaiser Health News hide caption

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Heidi de Marco/Kaiser Health News