Heart disease is used to describe problems with the heart, the arteries that supply blood, or the valves that keep the blood flowing in the right direction.

There are many types of heart problems. Some are caused by unhealthy habits, like smoking. Some viruses can cause damage and sometimes babies are born with a defect in a heart valve.

All sites submitted to this category must be designed for use by kids / teens and provide information on or about heart disease.

Websites designed for parents or teachers, or to sell products or services, will not be accepted.

English-only sites. Sites in other languages should be submitted to the appropriate category in /International.