Which came first: smoking or the anxiety disorder? Does smoking aggravate an existing anxiety disorder? Or is an existing anxiety disorder a risk factor for smoking?

Do teens' early sexual experiences determine their reproductive health and behaviors later in life? It depends slightly on how long teens wait to start having sex.

Depression affects 121 million people worldwide; the cost of depression, based on loss of productivity as well as necessary health care, reaches about $83 billion each year. With costs rising, effective and efficient depression treatment options have become an important topic.

Patients with heart arrhythmias are at a higher risk of potentially fatal heart attacks. In a recent study, fewer patients have reported out-of-hospital cardiac arrest. Does this suggest modern treatments are working?

Understanding cancer these days is all about understanding genetic mutations. They are the root of cancer and must be mapped out to develop new and more successful treatments.

Starting a diet can be rough, especially if the yo-yo of dieting and falling off the wagon are old habits. Spending time learning new skills before starting a diet may be best.

When it comes to the health of your heart, it's not just traditional risk factors at play. The chance of your heart stopping also may depend on where you live. Yes, your 'hood' impacts your health.

Most people have a hard time saying no to cuddling with a kitten — unless it causes sneezing, itchy eyes and a runny nose. But those with allergies might have a more cat-friendly future.

Do you find yourself raiding the fridge more often after not getting enough sleep? You're not alone. Too little sleep and overeating are linked.