Psychiatric disorders such as depression, anxiety and schizophrenia have long been something of a mystery, but new research is identifying the brain circuits and chemicals that are involved in such illnesses.

Among the multitude of chronic pain disorders is a condition called fibromyalgia. People with fibromyalgia have to deal with a variety of physical issues. But that's not all: the disorder also affects mood.

Like type 2 diabetes, Crohn's disease once was thought to be an adult illness. Not anymore. Children and adolescents are also plagued with this disease that plays havoc on the digestive tract.

In November, U.S. Secretary of State Hillary Clinton made an ambitious statement: An AIDS-free generation is possible. Clinton believes the epidemic can be ended in America within our lifetimes.

People with autism approach and deal with social interactions much differently than other people, and often struggle with relationships and social life. Autistic people process information in unusual ways but are often very high functioning in other areas.

James Carville, Sir Richard Branson, Michael Phelps, Howie Mandel…what do these famous people have in common? They all have attention deficit hyperactivity disorder.

"I stopped smoking years ago, but a lung-function test…showed that I had COPD," says actor and comedian Robert Klein. And that's the reality of smoking: every cigarette damages your lungs a little more and raises your risk of COPD, or chronic obstructive pulmonary disorder.

The signs of autism are met with distress and concern for most parents. Avoiding eye contact, not responding to their names, lack of interest in objects and delayed speech skills are all symptoms of autism, that show up before age three.

Rheumatoid arthritis can cause joint deformities and disability, but what if it could be prevented? Doctors may have found a way to identify the disease before it begins and actually stop it from developing.

It's not something that people like to talk about in public. It's a private matter. But talking to your doctor about overactive bladder is the first step to managing the condition.