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Some patients describe chronic fatigue syndrome as feeling like an "unrelenting flu." iStockphoto.com hide caption

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Many people with sleep apnea wear a CPAP machine mask in bed to help them breathe. Amy Walters/iStockphoto.com hide caption

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King Henry VIII famously suffered from gout. iStockphoto.com hide caption

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Keratoconus is an eye condition in which the normally round cornea thins, causing a cone-like bulge to develop. Courtesy of JirehDesign.com hide caption

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Peggy O'Brien-Murphy receives a massage from therapist Loretta Lanz. O'Brien-Murphy was among the participants in a study that found both relaxation and deep tissue massage are effective treatments for lower back pain. /Group Health Research Institute hide caption

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Being overweight or obese is a big risk factor for hypertension. iStockphoto.com hide caption

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Artificial hips have been a big advancement in treating debilitating arthritis. But there have been reports of medical issues — some serious — in patients with all-metal implants. iStockphoto.com hide caption

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A tattoo artist prepares inks before working on a client. The FDA says it wants to learn more about what goes into tattoo inks. Maggie Starbard/NPR hide caption

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Most Americans spend the majority of their waking hours sitting still in front of a computer or television. iStockphoto.com hide caption

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