Here’s what science has to say about a twice-yearly ritual affecting nearly 2 billion people worldwide.

U.N. Secretary-General António Guterres urged countries Monday not to lose hope in the fight against climate change, as representatives from nearly 200 countries gathered in Madrid for a two-week meeting on tackling global warming. In his opening speech to delegates, Guterres cited recent scientific data showing that levels of heat-trapping gases have hit a record high, reaching levels not seen...

The American Medical Association on Tuesday called for an immediate ban on all electronic cigarettes and vaping devices. The group adopted the sweeping stance at a policy-making meeting in San Diego. It aims to lobby for state and federal laws, regulations or legal action to achieve a ban, but the industry is sure to fight back.

Can old dogs teach us new tricks? Scientists are looking for 10,000 pets for the largest-ever study of aging in canines. They hope to shed light on human longevity too. The project will collect a pile of pooch data: vet records, DNA samples, gut microbes and information on food and walks. Five hundred dogs will test a pill that could...

People with severe but stable heart disease from clogged arteries may have less chest pain if they get a procedure to improve blood flow rather than just giving medicines a chance to help, but it won’t cut their risk of having a heart attack or dying over the following few years, a big federally funded study found. The results challenge...

Many older American adults may inaccurately estimate their chances for developing dementia and do useless things to prevent it, new research suggests. Almost half of adults surveyed believed they were likely to develop dementia. The results suggest many didn’t understand the connection between physical health and brain health and how racial differences can affect dementia risk. Substantial numbers of people...

Researchers from Texas A&M and the University of Washington are planning to study a slowed aging process pill on dogs.

Drug-resistant “superbug” infections have been called a developing nightmare that could set medicine back a century, making conquered germs once again untreatable. So there’s some surprising news in a report released Wednesday: U.S. superbug deaths appear to be going down. About 36,000 Americans died from drug-resistant infections in 2017, down 18% from an estimated 44,000 in 2013, the Centers for...

Some good health news: Americans’ cholesterol levels are dropping, and more people at especially high risk are getting treatment. Researchers say Monday’s report suggests a controversial change in recommendations for cholesterol treatment may be starting to pay off. “It is very heartening,” said Dr. Pankaj Arora of the University of Alabama at Birmingham, who led the study. “But there is...

Mercury is putting on a rare celestial show today, parading across the sun in view of most of the world. The solar system’s smallest, innermost planet will resemble a tiny black dot Monday as it passes directly between Earth and the sun. It begins at 7:35 a.m. EST. The entire 5 ½-hour event will be visible, weather permitting, in the...

The CDC reported that the number of vaping-related injuries grew by 8% over the last week, reaching 2,051 confirmed cases across the U.S.

Here’s what science has to say about a twice-yearly ritual affecting nearly 2 billion people worldwide.

Measles has a stealth side effect: New research shows it erases much of the immune system’s memory of how to fight other germs, so children recover only to be left more vulnerable to bugs like flu or strep. Scientists dubbed the startling findings “immune amnesia.” The body can rebuild those defenses — but it could take years. And with measles...

Measles has a stealth side effect: New research shows it erases much of the immune system’s memory of how to fight other germs, so children recover only to be left more vulnerable to bugs like flu or strep. Scientists dubbed the startling findings “immune amnesia.” The body can rebuild those defenses — but it could take years. And with measles...

An experimental vaccine proved 50% effective at preventing latent tuberculosis infection from turning into active disease in a three-year study of adults in Africa. Doctors were encouraged because protection declined only a little after two years, and even a partially effective vaccine would be a big help against TB. The lung disease kills more than a million people a year,...

U.S. health officials want women getting breast implants to receive stronger warnings and more details about the possible risks and complications. The Food and Drug Administration said Wednesday that manufacturers should add a warning highlighted by a box — the most serious type — to the information given to women considering implants. The agency is also recommending patients complete a...

So is red meat good or bad for you? If the answer were only that simple. A team of international researchers recently rattled the nutrition world by saying there isn’t enough evidence to tell people to cut back on red or processed meat, seemingly contradicting advice from prominent health experts and groups including the American Cancer Society and American Heart...

Dr. Anna Nguyen spoke with none of the five patients she treated on a recent weekday morning. She didn’t even leave her dining room.

Increasingly, health officials are using verbal autopsies — an interview in which a trained health worker asks a close relative or caretaker about a recently deceased person — and their computer algorithms to learn more about the global course of human disease. About 50 countries have attempted verbal autopsy projects, and the list is growing. On Tuesday, Bloomberg Philanthropies —...

Only two years ago, electronic cigarettes were viewed as a small industry with big potential to improve public health by offering a path to steer millions of smokers away from deadly cigarettes. That promise led U.S. regulators to take a hands-off approach to e-cigarette makers, including a Silicon Valley startup named Juul Labs, which was being praised for creating “the...