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Recalls of chia seed powders expand as 21 people in 12 states have been sickened by salmonella tied to the powder. The powder has a long shelf life, so consumers should check their pantries.

Chemicals and other toxic substances in the environment can cause premature birth, birth defects and developmental delays, but obstetricians say they're reluctant to discuss the threats with patients.

The child was brought to a treatment center in the back of a pickup truck with his dying mother. Doctors knew his condition was dire. But they thought that maybe they could save him.

It's called chikungunya. And it causes severe joint pain that can last for months. A quarter of a million people have caught the virus in the Caribbean. So how big a problem will it be stateside?

The deadliest Ebola outbreak in history continues to grow in West Africa. Even as health leaders met to figure out how to stop the virus, the number of cases surged by nearly 20 percent in a week.

We all think of airplanes as hotbeds for diseases. But how easily do pathogens spread on jets? One travel doctor explains what he does to keep from bringing home microbial stowaways.

Amid concerns about concussions and brain injuries, the law will limit full-contact drills for teams in both public and private schools.

People sometimes avoid information because they're afraid of bad news. But this "information aversion" can lead people to avoid medical tests that could save their lives.

The effort to end polio is taking a toll on Pakistan's already overstretched health system. With more children dying of measles and diarrhea, some question whether the focus on polio is worth it.

After caring for Ebola patients for several months in West Africa, Dr. Kent Brantly noticed last week that he had symptoms. The 33-year-old immediately put himself into a Liberian isolation ward.