(HealthDay News) -- Preparing for a marathon requires lots of training and preparation. Preparation afterthe race is just as important, experts say.

(HealthDay News) -- Infection with a norovirus, sometimes called stomach flu, causes symptoms such as vomiting, fatigue and diarrhea. The virus is easily spread in crowded, contained areas such as nursing homes or cruise ships.

THURSDAY, Feb. 14 (HealthDay News) -- Babies as young as 7 months can tell one language from another and begin to learn them even if they have very different rules of grammar, a new study suggests.

THURSDAY, Feb. 14 (HealthDay News) -- If you're hoping that a bouquet of flowers or a heart-shaped box of chocolates might give your relationship a boost this Valentine's Day, you might be disappointed.

THURSDAY, Feb. 14 (HealthDay News) -- If you're going to sign your child up for music lessons, you will want to do it sooner rather than later.

THURSDAY, Feb. 14 (HealthDay News) -- Doctors often urge older patients to get the shingles vaccine because it can prevent or cut the severity of this viral disease. But according to a new study, the vaccine may be less effective in people with untreated depression.

THURSDAY, Feb. 14 (HealthDay News) -- Chemotherapy can be a lifesaver for thousands of cancer patients, but a new study suggests that it might slightly raise the odds for a type of leukemia later in life.

THURSDAY, Feb. 14 (HealthDay News) -- In what researchers are calling a first, a new analysis suggests that the greater a woman's exposure to a type of common chemical compound called PFCs, the greater her risk for developing osteoarthritis.

THURSDAY, Feb. 14 (HealthDay News) -- In news that might one day help humans who struggle with type 1 diabetes every day, Spanish researchers report that a single session of gene therapy injections cured five beagle puppies who had the blood sugar disease.

THURSDAY, Feb. 14 (HealthDay News) -- Intimacy isn't bliss if it's too close for comfort.

Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

THURSDAY, Feb. 14 (HealthDay News) -- Sixteen cases of serious kidney damage caused by synthetic marijuana products were reported in six states last year, according to a new U.S. government study released Thursday.

THURSDAY, Feb. 14 (HealthDay News) -- Here's a new, and sobering, government statistic to ponder on Valentine's Day: More than 110 million men and women in the United States have a sexually transmitted infection.