WEDNESDAY, Nov. 30 (HealthDay News) -- Patients are much more likely to undergo unnecessary medical imaging exams if the tests are ordered by doctors with a financial interest in the imaging equipment, according to a new study.

(HealthDay News) -- Pneumonia can be a life-threatening infection, and no matter how severe your case is, your body needs time to heal.

(HealthDay News) -- It's common for children to feel jealous of a new sibling, including acting out and misbehaving.

WEDNESDAY, Nov. 30 (HealthDay News) -- Not all clogged arteries are created equal, with women and men facing different heart risks even when they have the same amount of coronary plaque, a new study suggests.

WEDNESDAY, Nov. 30 (HealthDay News) -- Toddlers who take anti-HIV drugs have higher cholesterol levels than those who do not have HIV, a new study shows.

WEDNESDAY, Nov. 30 (HealthDay News) -- In the vast majority of cases, researchers can distinguish between Alzheimer's and another form of dementia with shared symptoms by using a specific type of PET scan that looks for evidence of plaque in the brain, new research suggests.

WEDNESDAY, Nov. 30 (HealthDay News) -- Eating baked or broiled fish as little as once a week may boost brain health and lower the risk for mild cognitive impairment and Alzheimer's disease, new brain scan research suggests.

WEDNESDAY, Nov. 30 (HealthDay News) -- Whether it's talking on cellphones, fiddling with food and drink or doing some last-minute grooming, a large majority of adult drivers in the United States admit to being dangerously distracted while behind the wheel, a new poll shows.

WEDNESDAY, Nov. 30 (HealthDay News) -- About 40 percent of young adults who've attempted suicide made their first attempt before high school, which suggests that suicidal thoughts and behavior may begin much younger than previously believed, according to a new study.

WEDNESDAY, Nov. 30 (HealthDay News) -- Women with lobular breast cancer are nearly twice as likely as those with other forms of breast cancer to have a father who had cancer, especially prostate cancer, a new study finds.

WEDNESDAY, Nov. 30 (HealthDay News) -- As many parents can attest, a rough night may follow when their baby has been to the doctor for their first shots, due to increased fussiness or fever from the immunizations. But a new study suggests that the time of day that the shots are given may make a difference in both sleep and immune response.

WEDNESDAY, Nov. 30 (HealthDay News) -- New research shows how a concussion can cause damage in a young athlete's brain that may last longer than thought.

WEDNESDAY, Nov. 30 (HealthDay News) -- There may be a link between high blood sugar levels and an increased risk of colorectal cancer in older women, a new study finds.

TUESDAY, Nov. 29 (HealthDay News) -- No matter the material, all types of hip replacement devices appear to work the same, a new analysis finds.

WEDNESDAY, Nov. 30 (HealthDay News) -- Preliminary research suggests that a drug typically used to kickstart the immune system may help cancer patients who receive stem cell transplants and then develop a potentially deadly side effect.

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

WEDNESDAY, Nov. 30 (HealthDay News) -- People taking the blood-thinning drug warfarin who monitor their own blood and adjust their dosage can reduce the risk of blood clots by half, British researchers report.

WEDNESDAY, Nov. 30 (HealthDay News) -- Advocates for HIV/AIDS research and treatment met Wednesday to discuss how to reduce the spread of the disease in the United States, improve access to better care and raise general awareness of the ongoing epidemic.

WEDNESDAY, Nov. 30 (HealthDay News) -- The debate over the safety of fruit juice consumed by Americans escalated Wednesday with the release of a Consumer Reports study that found many apple and grape juice samples tainted with arsenic.