A to Z Health Guide 2007

The scientific bulletin of the year may be the stem-cell breakthrough. But 2007 provided a whole alphabet of big medical news. TIME's A-to-Z guide reviews them

By Coco Masters, Alice Park, Carolyn Sayre, Tiffany Sharples, Alexandra Silver and Kate Stinchfield

Chronic Fatigue

Judith Wagner / zefa / Corbis
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It's not easy to diagnose chronic fatigue syndrome (CFS), much less explain the cause of the condition, characterized by pervasive exhaustion and muscle aches. But scientists are tracking clues. Researchers in New South Wales, Australia, have identified three dozen genes that may be linked to the syndrome, while doctors in California have found possibly inflammatory viruses among patients with CFS. The inflammation may lead to the symptoms.

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