The human brain is still in a state of rapid development during the teen years. Can using marijuana disrupt normal brain growth? A recent study followed a group of teens for 15 years to see how marijuana affected their mental health.

The number of U.S. children and teens with elevated cholesterol appears to be steadily declining over the past 20 years, a large study has found.

Beta amyloid is linked to brain cell death in Alzheimer’s disease. And recent lab studies found that a common food chemical may enhance its harmful effects.

We know that the spread of HIV/AIDS is not bound by borders. But it has hit some parts of the country harder than others – a startling fact when seen on a map.

Laughter is the best medicine, it is said, and smiling is good for the soul, but are there real physical health benefits to the act of smiling?

New research indicates that a person's blood type appears to influence coronary heart disease risk. Individuals with type A and B are at a higher risk, while those with rarer type AB are at the greatest risk.

When breast cancer spreads to the bones, various drugs are available to control the disease. This class of drugs is called biophosphonates. A manufacturer-funded study suggests its drug is better than others.

Smoking cigarettes and drinking alcohol are two vices that can take a toll on your health in a variety of ways. More specifically, these habits may worsen certain types of arthritis.

The lowly aspirin is climbing to new heights of respect in the medical world. Its daily use is associated with a lower risk of heart disease. Cancer also seems to stay clear of this common medicine once dubbed a "miracle drug."