FRIDAY, Sept. 16 (HealthDay News) -- Sometimes a little fear might be a good thing.

(HealthDay News) -- Arthritis can affect any joint, but weight-bearing joints such as the knee are particularly vulnerable.

(HealthDay News) -- During the first trimester of pregnancy in particular, hormonal changes are responsible for nausea and vomiting that's often labeled "morning sickness."

FRIDAY, Sept. 16 (HealthDay News) -- Fall-prone older adults may be more at risk for taking a tumble because they don't slow their walking speed when their vision is impaired, a small new study suggests.

FRIDAY, Sept. 16 (HealthDay News) -- People who carry a certain genetic variant involved in blood clotting and inflammation have a lower five-year survival rate after coronary artery bypass surgery, researchers report.

FRIDAY, Sept. 16 (HealthDay News) -- Despite ongoing prevention efforts, a growing number of young children are being accidentally poisoned with medications, according to new research.

THURSDAY, Sept. 15 (HealthDay News) -- Men and women who develop visible deposits of cholesterol in the skin around their eyelids appear to face a higher risk of heart disease in general and suffering a heart attack in particular, new Danish research suggests.

THURSDAY, Sept. 15 (HealthDay News) -- The facts about cancer found on the website Wikipedia are about as accurate as the information on the disease found on the patient-oriented section of the U.S. National Cancer Institute's Physician Data Query (PDQ), a comprehensive peer-reviewed cancer database, according to a new study.

FRIDAY, Sept. 16 (HealthDay News) -- Although the U.S. Centers for Disease Control and Prevention reports that suicide is the third leading cause of death for people aged 15 to 24 years, a new study shows few suicidal teens are getting the mental health treatment they need.

FRIDAY, Sept. 16 (HealthDay News) -- Although there are more hysterectomies in the United States than in any other industrialized nation in the world, many American women do not have a clear understanding of the procedure and how it will affect their bodies, according to a new study.

FRIDAY, Sept. 16 (HealthDay News) -- Heart disease. Cancer. Lung disease. Diabetes.

FRIDAY, Sept. 16 (HealthDay News) -- After John West, an executive in the genetics industry, suffered two pulmonary embolisms in 2003 because of a genetic mutation he carries, he decided to have his two children tested to see if they had inherited the same vulnerability for dangerous blood clots.

FRIDAY, Sept. 16 (HealthDay News) -- People with dementia appear to be better off in small group homes rather than large nursing homes because they offer a domestic environment where patients can live as individuals, new research suggests.

FRIDAY, Sept. 16 (HealthDay News) -- When people are hungry, they are more likely to be angry or aggressive. And now researchers have found the reason why: serotonin levels -- a hormone that helps regulate behavior -- fluctuate when people are stressed out or haven't eaten, according to a new study.

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