CNN Health

An unidentified patient in Florida is being treated after being infected with a brain-eating amoeba last week, according to the Florida Department of Health. It is the fourth known case this year of infection by the parasite Naegleria fowleri.

Knuckle cracking may sound horrible, but these scans show knuckle cracking is actually good for your hands.

If you've read the news lately, you've probably learned about the tragic events involving two women who went out for a run and never made it home.

Shane Todd, a familiar face in the Centers for Disease Control and Prevention's well-known "Tips From Former Smokers" campaign, has died from complications of cancer. He was 49.

The Food and Drug Administration put the experimental drug esketamine (also known as ketamine) on the fast track to official approval for use in treating major depression, Janssen Pharmaceutical announced Tuesday. This designated "breakthrough therapy" would offer psychiatrists a new method for treating patients with suicidal tendencies and would qualify as the first new treatment for major depressive disorder in about half a century.

A new study out of Australia confirms what we probably already knew: People who dance and go to concerts regularly are pretty happy. While it may seem obvious, comparing happiness and the enjoyment of music can actually tell us a lot about how music affects us psychologically.

There were 27 heroin overdoses within four hours, including one death, in Huntington, West Virginia on Monday. Officials believe the drug may be laced with something making it particularly dangerous.

Amidst the billions of stars in the Milky Way, astronomers have witnessed the evolution of one as it exploded in what's known as a classical nova after hibernating for years, according to a new study (PDF). It is the first time the transition of a white dwarf star with a low and unstable mass-transfer rate to a classical nova eruption has been observed, study author Przemek Mróz said.

Hey, come look at this weird sea creature. It's so purple! And unnervingly alert!

A Georgia woman, paralyzed for eight years, shocked friends and family when she got up from her wheelchair and walked down the aisle at her wedding.

The story goes that, in 1815, Old Farmer's Almanac founding editor Robert B. Thomas was interrupted by a boy wondering what to put down for the weather forecast of July 13, 1816.

Parakeets are Britain's fastest-growing bird population, with breeding populations established in at least 65 cities across Europe.

The longer a woman is overweight or obese, the more her risk of cancer may increase along with the time.

Angola and the Democratic Republic of Congo began an emergency vaccination campaign this week to curtail a yellow fever outbreak that has sickened thousands of people and killed more than 400, the World Health Organization said. The two countries, which together reported more than 6,136 suspected cases and 953 confirmed cases since the outbreak began in December, plan to vaccinate more than 14 million people in more than 8,000 locations.

Some say the world will end in fire, but even those who favor such a Frost-ian demise probably don't want to be done in by something as abjectly terrifying as this "fire tornado"

Scientists are hot on the trail of an elusive and ancient squirrel-like creature called Zenkerella insignis. It's got fur and paws like a squirrel's but has a scaly-bottomed tail. For more than a century, researchers have been playing a real-life game of "Pokemon Go" with these creatures with absolutely no success ... at least until now.

For just more than two years, Nigerian health officials have been celebrating a country free of the paralyzing effects of the poliovirus.