CDC

The Centers for Disease Control has revised recommendations for treating ME/CFS and now says that vigorous exercise can make symptoms worse. Patient advocates say it's a huge victory.

U.S. doctors are prescribing opioid painkillers less often and at lower doses, but at rates that are three times higher than their European counterparts, the CDC says.

A mild winter is adding up to more insects, and that means more ticks—tiny creatures in the spider family that feed on the blood of mammals, birds, and humans.

The CDC says the death rate for black Americans fell 25 percent over 17 years and was especially dramatic for those 65 and older. But young black people are still dying earlier than white Americans.