Adults who take the anti-inflammatory drug ibuprofen may reduce their risk of getting Parkinson's disease by about 27 percent compared to those who do not, said a study published Wednesday.

"There is no cure for Parkinson's disease, so the possibility that ibuprofen, an existing and relatively non-toxic drug, could help protect against the disease is captivating," said senior author Alberto Ascherio of the Harvard School of Public Health.

Teenagers and young adults who use cannabis face increased risk of psychosis, research published in the British Medical Journal showed Wednesday.

Experts from Germany, the Netherlands and London's Institute of Psychiatry studied 1,900 people aged between 14 and 24 over a period of eight years.

A gel that has been shown to reduce the risk of HIV infection in women during vaginal sex has also shown promise toward preventing transmission during anal sex, U.S. researchers said on Monday.

"HIV was significantly inhibited in tissue samples from participants who used tenofovir gel daily for one week compared to tissue from participants who used the placebo gel," the study said.

Spine surgeon Anders Cohen puts a lot of stock in patients' expectations of pain relief. He prefers to operate only on those who "grab you by the collar and say, `I can't take it anymore.'"

New brain research proves doctors like Cohen are onto something: Pessimism can override the effectiveness of even powerful treatments.

The more advanced degrees a person has, the lower their blood pressure, a study published online has found.

An analysis of some 4,000 patient records from the 30-year Framingham Offspring Study found that, controlling only for age, women with 17 years or more of education -- a master's degree or doctorate -- had systolic blood pressure readings 3.26 millimeters of mercury lower than female high school drop-outs.

Most people put one in front of the other as a most basic way to get around, though they often come in handy to kick a ball, ride a bicycle or dance a jig -- maybe even walk a tightrope.

But in Asia, feet are far more than just the two pins that keep us upright and get us from A to B -- they can lead people into a cultural minefield.

Hot flashes that bedevil many women in menopause might actually be a good thing, depending on when they strike, according to new data from a long-running government study.

Women who had hot flashes at the start of menopause but not later seemed to have a lower risk for heart attack and death than women who never had hot flashes, or those whose symptoms persisted long after menopause began.

Organ traffickers in China could face the death penalty under a draft law being reviewed by the country's top legislature, state media reported Thursday.

Those convicted of "forced organ removal, forced organ donation or organ removal from juveniles" could face the same punishment as for homicide, which ranges from 10 years in prison to execution, Xinhua news agency said.

Two medical investigations published on Tuesday have strengthened arguments that modest daily consumption of alcohol is good for the heart and the blood system.

People who drink alcohol in moderate amounts -- equivalent to about one drink a day or less -- are between 14 and 25 percent less likely to develop cardiovascular disease than counterparts who drink no alcohol at all, they said.

U.S. scientists said Sunday there is strong evidence linking oral sex to cancer, and urged more study of how human papilloma viruses may be to blame for a rise in oral cancer among white men.

In the United States, oral cancer due to HPV infection is now more common than oral cancer from tobacco use, which remains the leading cause of such cancers in the rest of the world.