(HealthDay News) -- A so-called "mini-stroke," medically known as a transient ischemic attack (TIA), triggers stroke-like symptoms that last for less than a day -- usually for an hour or two.

(HealthDay News) -- The adenoids are lymphatic tissue, resembling the tonsils, found in the airway between the nose and back of the throat.

MONDAY, Jan. 17 (HealthDay News) -- Heart failure patients whose depression worsens with time are less likely to fare well in the long-run than patients whose depressive symptoms either stabilize or dissipate, a new study indicates.

MONDAY, Jan. 17 (HealthDay News) -- Among long-term breast cancer survivors, those who were treated with radiotherapy before 1984 appear to face much higher rates of death due to heart disease, new French-Swiss research indicates.

MONDAY, Jan. 17 (HealthDay News) -- Being poor can prevent young children from reaching their full genetic potential of mental ability, a new study shows.

MONDAY, Jan. 17 (HealthDay News) -- Among middle-school students, friendships can make the difference between good and poor grades, researchers have found.

FRIDAY, Jan. 14 (HealthDay News) -- Researchers have simultaneously discovered a gene that seems to raise the risk of cardiovascular disease, while also noting that having the blood type O might guard against heart attack once arteries become clogged.

MONDAY, Jan. 17 (HealthDay News) -- Tobacco advertisements really do prompt teenagers to smoke, say the authors of a new study that calls for a ban on cigarette ads.

MONDAY, Jan. 17 (HealthDay News) -- Patients at high risk for melanoma benefit from a follow-up program that can detect the deadly skin cancer at an early stage, new research finds, while a second study notes that embarrassment prevents some people from having a doctor examine their skin for suspicious lesions.

MONDAY, Jan. 17 (HealthDay News) -- Video game addiction among children and teens may lead to the development of psychological disorders such as depression, researchers say.

MONDAY, Jan. 17 (HealthDay News) -- A blood-filtering procedure called plasma exchange helps ease severe flares of multiple sclerosis (MS), but does not help with more advanced, progressive forms of the disease, new guidelines say.

MONDAY, Jan. 17 (HealthDay News) -- The U.S. Preventive Services Task Force has just expanded its osteoporosis screening recommendation to include younger women who have risk factors for the debilitating disease, which causes bones to become abnormally brittle and prone to fracture.

MONDAY, Jan. 17 (HealthDay News) -- People who drink a lot, and do so often, increase their chances of developing the chronic heart rate or rhythm disorder called atrial fibrillation, according to Japanese researchers.

MONDAY, Jan. 17 (HealthDay News) -- Few facial skin creams that promise "broad-spectrum" sun protection actually measure up, according to new research.

MONDAY, Jan. 17 (HealthDay News) -- Conventional wisdom says that eating a big breakfast might keep you full throughout the day and help prevent overeating at other meals, but a new German study debunks the idea.

MONDAY, Jan. 17 (HealthDay News) -- Older people who are taking common blood pressure medications called calcium channel blockers face an increased risk of developing dangerously low blood pressure and possibly going into shock if they take certain antibiotics, Canadian researchers warn.

MONDAY, Jan. 17 (HealthDay News) -- Arizona Congresswoman Gabrielle Giffords continues her remarkable recovery after she was gravely wounded by an assassin's bullet to her brain nine days ago: On Sunday, her doctors upgraded her condition from critical to serious.

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

MONDAY, Jan. 17 (HealthDay News) -- Your friends aren't just people you enjoy: You tend to befriend others with similar or complementary genes, a new study suggests.

(HealthDay News) -- Here are the latest clinical trials, courtesy of ClinicalConnection.com: