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

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