Separate studies report chronic tension is a significant factor for cardiac risk.Chronic tension between spouses can raise the risk of heart disease by 25%, and high job stress can double the risk of a second heart attack or unstable angina, according to two separate studies published this week.

  A new report says there were 1 million new cases of sexually transmitted diseases among people.An estimated 1 million young Californians had a sexually transmitted disease in 2005, including 1 in every 4 or 5 young people in Los Angeles County, researchers said Tuesday.

  Lawsuits and violations reveal problems in a luxury cottage industry for the addicted.Hollywood rehab can produce unhappy endings, even when the patient isn't named Lindsay or Britney.

  The author of Jones' book talks about watching her as a young star and his reflections on what might have made the superb athlete resort to performance-enhancing substances.At the 2000 U.S. Olympic track and field trials in Sacramento, Joan Benoit Samuelson, who won the first women's Olympic marathon in Los Angeles in 1984, entered a corporate box above the stadium with her two young daughters and saw Marion Jones watching the competition on the track below. The girls were fascinated by Jones, Samuelson told a publicist. Would it be possible for them to meet her?

  Their individual gene work involving 'designer mice' has helped researchers test new drugs and treatments.Two Americans and a Briton were awarded the 2007 Nobel Prize in physiology or medicine Monday for their work in creating "designer mice" -- experimental animals in which genes have been added or removed to test theories about the links between genes and disease.

  Evaluation within 24 hours after even a mild episode greatly reduces the chance of recurrence, researchers report.Patients who receive treatment for a minor stroke within 24 hours reduce their risk of a second stroke by 80% compared with those who wait three days or more to see a doctor, according to a new study released today.

  Today on the web: Diet and the perils of an 'informational cascade' * Chronic lyme disease dismissed as nonexistent * Tasers might not be pleasant, but they are safe, research finds * Brain imaging now used to sell products * Tips to help you remember.

  Nitric oxide, needed to deliver oxygen to tissues, breaks down quickly, researchers say. Such transfused blood is given to millions each year.Much of the stored blood given to millions of people every year may lack a component vital for it to deliver oxygen to the tissues.

  As depression eases, patients often want to stop treatment. But are they better? Will they relapse?PEOPLE come into Andrew Leuchter's office, saying they're better, saying they want to stop. "Oh, gosh, it happens all the time," says Leuchter, a psychiatrist at UCLA's Semel Institute for Neuroscience and Human Behavior. "They say they feel OK, that they don't need drugs or any other help, and that they've recovered. On one hand that's very encouraging, but on the other hand we have to be very careful, because the cost of being wrong -- if they are not ready -- can be very high."

  The antioxidant seems to work wonders in the rodents, but there's little research in humans.This antioxidant can protect against cancer, heart disease and diabetes. It can lower cholesterol, reduce inflammation and ease pain. Best of all, perhaps, it can help users live 30% longer than they would without it.