(HealthDay News) -- Training can help strengthen your body and prepare you for an athletic event. But you're not doing yourself a favor by overtraining, the Cleveland Clinic says.

(HealthDay News) -- Nothing can spoil the fun of preparing your favorite recipe like burning yourself or a child in the process.

THURSDAY, May 12 (HealthDay News) -- Use of the illegal drug ecstasy is associated with long-term changes in brain function, a new study finds.

THURSDAY, May 12 (HealthDay News) -- A new study shows that a retrovirus called XMRV is not present in the blood of people with chronic fatigue syndrome, a finding that contradicts previous research that linked XMRV to the condition.

THURSDAY, May 12 (HealthDay News) -- Young children may have memories stretching back to late infancy, but these memories fade away as childhood proceeds, a new Canadian study finds.

THURSDAY, May 12 (HealthDay News) -- Giving adrenalin to people with snakebites helps prevent severe allergic reactions to antivenom treatment, new research finds.

THURSDAY, May 12 (HealthDay News) -- A new study finds that water wells near shale gas drilling and hydraulic fracturing sites have high levels of potentially explosive methane gas.

THURSDAY, May 12 (HealthDay News) -- Italian researchers report that some people who think they are lactose-intolerant may actually suffer from a psychological condition known as somatoform disorder.

THURSDAY, May 12 (HealthDay News) -- Mind-body therapies such as yoga, meditation and deep-breathing exercises appear to be gaining more acceptance in mainstream medicine, according to a new study.

THURSDAY, May 12 (HealthDay News) -- Music hath charms to protect the aging brain.

THURSDAY, May 12 (HealthDay News) -- When positioned properly, the headphones of MP3 players won't cause problems for patients with implantable cardiac devices, a new study shows.

THURSDAY, May 12 (HealthDay News) -- Children in both China and the United States who want to please their parents tend to do better at school, new research finds.

THURSDAY, May 12 (HealthDay News) -- Heart failure patients who are older than 65 and have a high level of health literacy are more likely to continue using telemonitoring technology that tracks their condition than younger people with low health literacy, a new study finds.

WEDNESDAY, May 11 (HealthDay News) -- Due to an ongoing shortage, some American adults with attention-deficit hyperactivity disorder (ADHD), or the parents of children with ADHD, are having to call multiple pharmacies before finding one that carries the prescription they need to manage the condition.

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

THURSDAY, May 12 (HealthDay News) -- Five cases of antibiotic-resistant gonorrhea found in San Diego County between August and October 2009 show the need for continued surveillance for such cases, according to a new report from public health officials.

THURSDAY, May 12 (HealthDay News) -- Large metropolitan areas suffer about two-thirds of all firearm homicides in the United States, with inner cities most affected, according to a new report from the U.S. Centers for Disease Control and Prevention.

THURSDAY, May 12 (HealthDay News) -- Representatives for veteran TV sitcom star Mary Tyler Moore report that she entered a facility for surgery to remove a meningioma -- a type of tumor, usually benign, that can occur on the meninges, the brain's protective outer membrane.

THURSDAY, May 12 (HealthDay News) -- People with HIV can reduce the risk of infecting their sex partners by more than 90 percent if they start treatment with antiretroviral drugs when their immune system is still relatively healthy, researchers announced Thursday.