(HealthDay News) -- Pneumonia is a lung infection caused by a bacterium, virus or fungus. Often, the lungs' air sacs fill with fluid or pus, making it difficult to breathe.

(HealthDay News) -- Back pain is common among new moms, who always seem to be lifting and carrying their newborns.

TUESDAY, Feb. 28 (HealthDay News) -- Drug-free recovery housing and day treatment programs greatly improve the chances that those addicted to opioids who have gone through detoxification will be able to kick the habit, a new study shows.

TUESDAY, Feb. 28 (HealthDay News) -- Exposure to bisphenol A (BPA), a controversial chemical commonly used to make plastics, increases a person's risk of developing heart disease later in life, a new study suggests.

MONDAY, Feb. 27 (HealthDay News) -- Hearing loss is associated with an increased risk of falling, according to a new study.

TUESDAY, Feb. 28 (HealthDay News) -- Many parents who bring their children to the emergency room with fevers are making the right decision, Dutch investigators report.

TUESDAY, Feb. 28 (HealthDay News) -- Researchers who used family trees dating back to 1811 to estimate the death risk for people with inherited heart rhythm disorders say their findings can help doctors determine when to screen and treat today's patients with these disorders.

TUESDAY, Feb. 28 (HealthDay News) -- Even when fast-food restaurants list calorie counts for menu items, diners may still have a hard time using the information to make healthy meal choices, researchers report.

TUESDAY, Feb. 28 (HealthDay News) -- Vegetarians and others who avoid eating meat for religious or cultural reasons may unknowingly be consuming gelatin derived from animal products when they take prescription medications, a new study found.

MONDAY, Feb. 27 (HealthDay News) -- Disabled adults are at higher risk of being victims of violence than adults who aren't disabled, new research finds.

TUESDAY, Feb. 28 (HealthDay News) -- Menstrual cramps are the bane of many women, but new research suggests that a form of vitamin D may one day be added to the meager list of pain relievers for the sometimes disabling condition.

TUESDAY, Feb. 28 (HealthDay News) -- Teenagers who suffer a concussion are more sensitive than adults or children to its aftereffects, Canadian researchers report.

MONDAY, Feb. 27 (HealthDay News) -- Prescription sleeping pills may help you get some much needed rest at night, but using them routinely might also make it more likely that you will die or develop certain types of cancer, research suggests.

TUESDAY, Feb. 28 (HealthDay News) -- Taking the hallucinogen ecstasy during pregnancy may harm the health of the fetus and lead to poorer motor control in infants, a new study suggests.

TUESDAY, Feb. 28 (HealthDay News) -- A new influenza A virus has been discovered in Guatemalan fruit bats, according to scientists at the U.S. Centers for Disease Control and Prevention.

TUESDAY, Feb. 28 (HealthDay News) -- Poor people are less likely to sue their doctor than patients with more money are, a new study shows.

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

TUESDAY, Feb. 28 (HealthDay News) -- While getting the right amount of selenium in your diet can boost your immune function and lower your risk of death, you can get too much of a good thing. Higher-than-normal levels of selenium may contribute to the development of type 2 diabetes, hair loss and certain cancers, a new review of evidence finds.

TUESDAY, Feb. 28 (HealthDay News) -- The popular cholesterol-lowering drugs called statins will now come with revised labels warning of a slight increased risk of elevated blood sugar levels, which could lead to type 2 diabetes, as well as a warning on rare cases of confusion and memory loss, U.S. drug regulators said Tuesday.

TUESDAY, Feb. 28 (HealthDay News) -- A pen-delivery version of the multiple sclerosis drug Avonex has been approved by the U.S. Food and Drug Administration, drug manufacturer Biogen Idec said Tuesday.