(HealthDay News) -- Hip bursitis occurs when the bursa, a small sac of fluid that cushions the hip joint, becomes inflamed.

(HealthDay News) -- A sudden impact from a car crash or a bad fall can lead to a neck sprain.

FRIDAY, Feb. 10 (HealthDay News) -- There's a clear link between obesity and pain, suggests a new study that finds the heaviest people suffer the greatest discomfort.

FRIDAY, Feb. 10 (HealthDay News) -- People with the condition called Barrett's esophagus who are smokers may have double the risk of developing esophageal cancer, a new study warns.

FRIDAY, Feb. 10 (HealthDay News) -- The size of a man's prostate gland may help doctors predict the severity of his prostate cancer, according to a new study.

FRIDAY, Feb. 10 (HealthDay News) -- Most children and teens who deliberately injure themselves are discharged from emergency rooms without an evaluation of their mental health, a new study shows.

FRIDAY, Feb. 10 (HealthDay News) -- Many gay men who regularly have risky sex would be willing to ask partners to use a new, rapid-result HIV test, a new study shows.

FRIDAY, Feb. 10 (HealthDay News) -- There's little evidence linking disease severity or antiretroviral treatment with the degree of psychiatric symptoms in HIV-positive children and teens infected around the time of birth, according to a new study.

FRIDAY, Feb. 10 (HealthDay News) -- It was just about three years ago that a strange new strain of flu first appeared in Mexico, then spread across the border to the United States and eventually much of the globe.

FRIDAY, Feb. 10 (HealthDay News) -- Young adults who quit smoking saw improvements in coughing and other respiratory symptoms within a few weeks, a new study indicates.

FRIDAY, Feb. 10 (HealthDay News) -- Researchers report that brain scans can help predict how people will perform a challenging mental task, a discovery that could lead to a better understanding of how the mind learns new things.

FRIDAY, Feb. 10 (HealthDay News) -- A new childbirth study says 39 weeks' gestation is the best time for elective Cesarean delivery for women who have previously delivered via C-section.

FRIDAY, Feb. 10 (HealthDay News) -- Using padded headgear and boxing gloves helps boxers reduce the impact of hits to the head, a new study finds.

THURSDAY, Feb. 9 (HealthDay News) -- A new study finds that the babies of women who had chemotherapy while pregnant aren't at higher risk for a variety of medical disorders, a sign that the treatment should be safe for the fetus in most instances.

FRIDAY, Feb. 10 (HealthDay News) -- Breast-feeding reduces the risk of obesity in children born to mothers with diabetes during their pregnancy, a new study indicates.

FRIDAY, Feb. 10 (HealthDay News) -- More than 4 million Americans now live with an artificial knee, and increasing numbers of younger patients are undergoing knee replacement surgery, new research reveals.

THURSDAY, Feb. 9 (HealthDay News) -- Getting behind the wheel within three hours after using marijuana nearly doubles a driver's risk of having an accident, a large new research review finds.

FRIDAY, Feb. 10 (HealthDay News) -- Babies whose mothers choose to deliver at home are at higher risk of complications after birth, including low Apgar scores and seizures, a new study finds.

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

FRIDAY, Feb. 10 (HealthDay News) -- Facing a firestorm of criticism from Catholic leaders, the Obama administration on Friday said it will adjust its health care guideline mandating that religious employers provide women with access to birth control.