One big part of the puzzle: Why have there been so many microcephaly cases in the northeastern tip of Brazil?

Republican Senate leader Mitch McConnell took a gamble in not advancing the Supreme Court nomination of a centrist judge. It's about to pay off.

There were expectations that Donald Trump would do worse with Latino voters than any candidate in history, but that didn't happen.

The federal government pays for kidney transplants. But the program only pays for essential anti-rejection drugs for three years. Many people can't afford them, and can end up losing the kidney.

Donald Trump should deal with how to handle his business holdings before he takes office, Newt Gingrich says. The former House speaker suggests a panel of experts monitor Trump's business conflicts.

Seeing someone close to you experience racial discrimination may have more of an effect on health than experiencing that discrimination yourself, a study finds.

New York City wants to erase the personal information of people who've received municipal IDs — including, potentially, thousands of undocumented immigrants. State lawmakers are trying to stop them.

Doctors have commonly managed the persistent pain of people over 65 with prescription opioids. But that has left some still in pain, and with a physical and emotional dependence that can ruin life.

Babies exposed to marijuana smoke have metabolites of the drug in their urine, researchers say. They think that secondhand marijuana smoke will prove to be as dangerous as secondhand tobacco smoke.

At a meeting in San Francisco, thousands of researchers are pondering how they can influence President-elect Donald Trump's thinking on climate change.