Although marijuana may relieve pain when taken in moderate doses, an excessive amount may actually lead to the worsening of the pain, says two recently-published studies by McGill University researchers, and University of California researchers.

The study done in the University of California followed a procedure that included shooting capsaicin, the main ingredient for pepper spray, under the skins of 15 healthy subjects. The volunteers were then given doses of marijuana

Sleep deprivation can cause the brain's emotional centers to overreact to negative experiences, including depression, anxiety, and other psychiatric disorders, a new study has found.

Researchers from the University of California, Berkeley, and Harvard Medical School found that lack of sleep results in shutdown of the prefrontal lobe, a brain region responsible for controlling the emotions

monetary reward for child births, better contraception use and improved sex education are behind the fall of teenage abortions in Australia.

Victoria state recorded 1,724 teenage abortions in 2005-06, down from 1,835 the year before and 1,845 reported in 2003-04. Teenage births increased in Victoria from 1,816 in 2003 to 1,931 last year

Caregivers, waiters and social workers have the highest rates of depression among full-time U.S. employees, according to a government report released Saturday.

Almost 11 percent of personal care workers, including those tending the elderly, disabled and children, reported depression lasting two weeks or longer

A bad marriage or problems with close friends such as a conflict and adverse exchanges leads to stress and boost the risk of heart disease, according to a new study.

In a study of 9,011 British married people, the researchers found that those with the worst close relationships were 34 percent more likely to have heart attacks or other heart trouble during 12 years of follow-up as compared to the ones with good relationships. That included partners, close relatives and friends