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GENEVA - The number of people worldwide infected with the virus that causes AIDS - about 33 million - has remained virtually unchanged for the last two years, United Nations experts said Tuesday.

Last week, the US Preventive Services Task Force published new guidelines that recommended against routine mammography screening for women in their 40s and less-frequent screening for older women at average risk of developing breast cancer.

Nov. 23, 2009 -- Prenatal exposure to tobacco smoke and childhood exposure to lead are linked to increased risk of attention deficit hyperactivity disorder ( ADHD) in children, a new study shows.

What could be done to prevent another Vioxx? This pain medication for arthritis became a blockbuster after its introduction in 1999, only to be taken off the market in 2004 when a study linked the drug to an increased risk of heart ...

Pfizer has been ordered to pay a total of $103 million in punitive damages to two women who were found to have breast cancer after they used hormonal drugs, state court officials in Philadelphia said Monday.

RIYADH (Reuters) - More than two million Muslims gather this week for the annual haj pilgrimage to Islam's holy city of Mecca, where Saudi authorities hope to minimize spread of the H1N1 virus and prevent any political demonstration.

WASHINGTON (Reuters) - Cases of a drug-resistant bacterial infection known as MRSA have risen by 90 percent since 1999, and they are increasingly being acquired outside hospitals, researchers reported on Tuesday.

It's been a tough 10 years for corporate America, but you wouldn't know it by looking at the nation's biggest health care firms.

AP LOS ANGELES—The Los Angeles City Council will consider provisions to a proposed medical marijuana ordinance they have struggled with for two years.

AP - November 24, 2009 6:25 AM ET BASEL, Switzerland (AP) - Swiss pharmaceuticals maker Novartis has opened a plant in North Carolina to make flu vaccines using cell cultures instead of egg-based methods.

Nov. 23 (Bloomberg) -- Sanofi-Aventis SA and Bristol-Myers Squibb Co.'s best-selling blood thinner Plavix may have cost US taxpayers hundreds of millions of dollars because of ineffective advertising, research suggests.

More than 180 million people worldwide have diabetes, according to the World Health Organization. In 2005, an estimated 1.1 million people died from the disease.

Nov. 23, 2009 -- A new study of the weight loss drug Meridia is in the hands of FDA regulators, who've released an early communication based on preliminary data: certain patients taking the drug may have a higher risk of heart attacks, strokes, ...

The same day they rejected a gay marriage ballot measure, residents of Maine voted overwhelmingly to allow the sale of medical marijuana over the counter at state-licensed dispensaries.

Starting today, any motorist with a passenger younger than 8 who is not restrained by a booster seat or other child-restraint system will be violating state law.

Ask survivors to describe the impact of their heart attacks, and a common theme is that it was a “wake-up call.” Unfortunately, many people seem to hit the snooze alarm once the danger has passed.

Inside an unremarkable three-story office building near Santana Row, Richard Noonan waited last week in the San Jose Cannabis Buyers Collective lobby for the marijuana he uses to treat symptoms of palsy.

Seven yet-to-be-named appointees would decide how to run the hospital and whom to hire. Outpatients wait in the lobby of the clinic that operates at the Martin Luther King Jr.

Parents should find a much safer selection when they go hunting for toys this holiday season. That's because the Consumer Product Safety Improvement Act that took effect earlier this year aimed to limit phthalates and lead levels in toys.