Nexium is one of several popular medications for heartburn and acid reflux called proton-pump inhibitors. Daniel Acker/Bloomberg via Getty Images hide caption

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Isabel Seliger for NPR

A hearing test you take on your phone provides immediate, private feedback. George Doyle/Ocean/Corbis hide caption

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After years fighting a heroin addiction, Danny Montgomery, 33, is receiving inpatient treatment that is being paid for by Los Angeles County. Anna Gorman/KHN hide caption

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A group at MIT built this tiny package of sensors to collect vital signs as it travels through the digestive system. Albert Swiston/MIT hide caption

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Diane Bigda/Getty Images/Illustration Works

Alan Hoffman, shown with his wife, Nancy, at their home in Dumfries, Va., found that his Parkinson's symptoms improved when he took a cancer drug. Claire Harbage for NPR hide caption

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Ductal carcinoma in situ sometimes can turn into invasive breast cancer, but there's currently no test that can tell when it's dangerous and when it's not. Steve Gschmeissner/Science Photo Library/Corbis hide caption

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Ovarian tissue containing hundreds of small resting eggs is prepared to be transplanted back after cancer treatment. Courtesy of Claus Yding Andersen hide caption

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