(HealthDay News) -- Cirrhosis, often the result of a viral disease or chronic alcoholism, occurs when liver cells are damaged and cannot fix themselves.

(HealthDay News) -- Gangrene occurs when a portion of bodily tissue dies due to lack of blood supply to the area.

SUNDAY, Nov. 14 (HealthDay News) -- The course of true love may not run smoothly for some people with highly sensitive allergies, experts say, since kissing or other intimate contact can pose risks for sometimes serious reactions.

SUNDAY, Nov. 14 (HealthDay News) -- If you're an incessant cell phone user and a mysterious rash appears along your jaw, cheek or ear, chances are you're allergic to nickel, a metal commonly used in cell phones.

MONDAY, Nov. 15 (HealthDay News) -- Most teens who play video games don't fall into unhealthy behaviors, but an "addicted" minority may be more likely to smoke, use drugs, fight or become depressed, a new Yale University study suggests.

MONDAY, Nov. 15 (HealthDay News) -- People who wear multifocal contact lenses have more difficulty driving at night than those who wear glasses, a new study finds.

SATURDAY, Nov. 13 (HealthDay News) -- For people stricken with sudden cardiac arrest, doctors often resort to a brain-protecting "cooling" of the body, a procedure called therapeutic hypothermia.

SATURDAY, Nov. 13 (HealthDay News) -- When implemented, the American Heart Association's 2005 guidelines on cardiopulmonary resuscitation (CPR) can dramatically boost survival rates among people being treated outside a hospital setting, according to an expert report.

SUNDAY, Nov. 14 (HealthDay News) -- Teens who eat less salt lower their long-term risk for high blood pressure, heart disease and stroke, new research indicates.

SUNDAY, Nov. 14 (HealthDay News) -- New research suggests that vitamin D deficiency does not boost stroke death rates among black patients, even though it appears to double the risk for whites.

SUNDAY, Nov. 14 (HealthDay News) -- In the months following the death of a spouse or a child, the surviving spouse or parent may face a higher risk of heart attack or sudden cardiac death due to an increased heart rate, new research suggests.

MONDAY, Nov. 15 (HealthDay News) -- Could cholesterol deposits on or around people's eyelids help doctors assess cardiovascular risk?

MONDAY, Nov. 15 (HealthDay News) -- Doctors may be able to monitor stroke risk in pacemaker recipients by tracking the incidence of a type of irregular heartbeat called atrial fibrillation, new research suggests.

MONDAY, Nov. 15 (HealthDay News) -- Warfarin patients who use herbal and dietary supplements are often unaware that combining them with the blood thinner may make it ineffective and even dangerous, new research suggests.

MONDAY, Nov. 15 (HealthDay News) --School-based programs that teach CPR and the proper use of automated external defibrillators (AED) boost survival rates from sudden cardiac arrest, new research reveals.

MONDAY, Nov. 15 (HealthDay News) -- In Australia, where universal health care is available to all, heart disease is not much more prevalent among poor citizens than it is among the rich, a new study has found.

SATURDAY, Nov. 13 (HealthDay News) -- People who have a first-degree relative with atrial fibrillation are at increased risk themselves for the potentially deadly heart rhythm disorder, a new study finds.

SUNDAY, Nov. 14 (HealthDay News) -- As children mature, increased synchronization between specific areas of the brain alter how they view themselves and others, a new study suggests.

SUNDAY, Nov. 14 (HealthDay News) -- Canadian researchers report that an implantable device called a resynchronization therapy-defibrillator helps keep the left side of the heart pumping properly, extending the life of heart failure patients.

MONDAY, Nov. 15 (HealthDay News) -- People who started smoking marijuana at a young age did much worse on tests of executive brain function than those who started smoking when they were older, a new study shows.

SATURDAY, Nov. 13 (HealthDay News) -- It's a common belief that as you get older, your allergy symptoms will wane, but a new study suggests it's possible that even more older people will be experiencing allergies than ever before.

MONDAY, Nov. 15 (HealthDay News) -- Poor handwriting among children with autism tends to persist well into the teen years, a new study finds.

SUNDAY, Nov. 14 (HealthDay News) -- The Twin Cities of Minneapolis and St. Paul saw a sharp decline in the number of adult smokers over the last three decades, perhaps mirroring trends elsewhere in the United States, experts say.

MONDAY, Nov. 15 (HealthDay News) -- Omega-3 fatty acid supplements don't cut back on recurrences of atrial fibrillation, a type of irregular heartbeat that can cause stroke, new research suggests.

SUNDAY, Nov. 14 (HealthDay News) -- Women who have taxing jobs with little control over their busy days are at higher risk for heart attacks or the need for coronary bypass surgery, new research suggests.

SUNDAY, Nov. 14 (HealthDay News) -- Moderate drinking may be good for your health -- better, in fact, than not drinking at all, according to a trio of studies presented Sunday at the American Heart Association annual meeting in Chicago.

MONDAY, Nov. 15 (HealthDay News) -- Although automated external defibrillators have been found to reduce heart attack death rates in public places such as restaurants, malls and airplanes, they have no benefit and, paradoxically, seem to increase the risk of death when used in hospitals, a new study suggests.

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

MONDAY, Nov. 15 (HealthDay News) -- A new blood thinner might be a viable alternative to warfarin (Coumadin), the standard for decades to treat patients with the dangerous heart rhythm disorder known as atrial fibrillation.

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

MONDAY, Nov. 15 (HealthDay News) -- Vyvanse (lisdexamfetamine dimesylate) capsules have been approved by the U.S. Food and Drug Administration to treat attention deficit hyperactivity disorder (ADHD) among adolescents aged 13 to 17, maker Shire Pharmaceuticals said Monday.

MONDAY, Nov. 15 (HealthDay News) -- It rarely happens, but that's little comfort for those involved: Sometimes surgical instruments and sponges are left inside children undergoing surgery, according to researchers from Johns Hopkins University.

MONDAY, Nov. 15 (HealthDay News) -- In these tough economic times, even people with health insurance are leaving prescription medications at the pharmacy because of high co-payments.

MONDAY, Nov. 15 (HealthDay News) -- New research shows that few Americans make the simple lifestyle changes that experts say could prevent most cases of heart disease.

MONDAY, Nov. 15 (HealthDay News) -- Halaven (eribulin mesylate) has been approved by the U.S. Food and Drug Administration to treat metastatic (spreading) breast cancer among people who have had at least two prior chemotherapy treatments for late-stage disease.