For many teenagers, anxiety is more than occasional stress or nerves. It can make school feel overwhelming, strain friendships and turn everyday situations into something that feels unmanageable.

Federal housing assistance may help reduce young children's exposure to lead, according to a new study published in the journal Environmental Epidemiology.

Two nationally recognized scientists with decades of experience advising U.S. vaccine policy argue that it is a mistake to exclude well-designed observational studies when determining how well vaccines work year to year.

Researchers have uncovered a clue to why immune checkpoint inhibitors-cancer therapies that release the immune "brakes" exploited by tumors to evade attack-show limited efficacy in some brain tumors.

Artificial intelligence is rapidly improving scientists' ability to detect chemicals in the environment and human body.

An eight-week randomized trial of 66 women found that adjunctive vitamin D did not significantly or meaningfully improve endometriosis pain or quality of life compared with placebo during dienogest therapy. The results do not support routine short-term adjunctive supplementation, although the brief trial and absence of post-treatment vitamin D measurements leave longer-term effects uncertain.

"Turn off that TV, it'll rot your brain!" has been a household refrain for decades. While "rot" might be too strong a term, researchers are finding that the overall sentiment could have some merit.

Scientists have long known that the human brain continues developing well beyond the teenage years, with important changes involving decision-making and emotional regulation extending into the mid-to-late 20s.

Many of the world's leading causes of irreversible blindness, including glaucoma and age-related macular degeneration, share a common problem: the buildup of fluid, waste and inflammatory debris in the back of the eye.

When cardiac arrest strikes outside of a hospital, survival rates remain unacceptably low, often because CPR is not administered immediately, according to the American Heart Association.