Michael Arnott, of Cambridge, Mass., says he used to have trouble staying awake on long drives. Sleep specialists discovered he has obstructive sleep apnea, though not for the most common reasons — he isn't overweight, and doesn't smoke or take sedatives. M. Scott Brauer for NPR hide caption

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A Stanford University study explored the medical records of millions of people looking for patterns. People taking proton-pump inhibitors for chronic heartburn seemed to be at somewhat higher risk of having a heart attack than people not taking the pills. IStockphoto hide caption

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Some men take testosterone hoping to boost energy and libido, or to build strength. But at what risk? iStockphoto hide caption

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Aspirin has been prescribed for decades as a simple way to reduce heart disease risk, but doctors still aren't sure how it works. iStockphoto.com hide caption

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Insomnia, feeling isolated, and bursts of anger are symptoms of the anxiety disorder known as PTSD. iStockphoto.com hide caption

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The danger of death by heart attack or suicide is greatest in the first week after a cancer diagnosis. Max Delson Martins Santos/iStockphoto.com hide caption

itoggle caption Max Delson Martins Santos/iStockphoto.com