Unstable angina - angina that occurs at rest and apparently for no reason - is a strong warning that one of the coronary arteries has become critically unstable, and that without rapid treatment a full-blown heart attack may ensue. Read about what causes unstable angina, how to recognize it, and how to make sure you are getting the appropriate care, here.

A recent report suggests that regular napping may reduce the risk of heart disease. But before you begin lobbying your congressperson for mandated nap time, read this.

In recent years, people have been encouraged to estimate their body mass indexes (BMI) to help assess cardiac risk. BMI is meant to be an estimate of whether you are of normal weight (for your height), underweight, overweight or obese. However, recent evidence suggests that, at least for people in the "overweight" category, the overall level of cardiac fitness and the amount of abdominal fat may be more important than BMI. Read more about it here.

People who adopt five simple lifestyle choices can reduce their risk of cardiac disease by an astounding degree. Furthermore, at least one of these lifestyle choices is counted by many as a forbidden pleasure, and large and powerful organizations exist to keep you from doing it. You need read about this. You can do it here.