A cardiologist is a doctor who specializes in the heart and blood vessels.

They diagnose and treat conditions such as:

• High blood pressure
• Heart disease
• Heart attacks
• Irregular heart rhythms
• Heart failure
• Problems with heart valves

Cardiologists may use tests such as electrocardiograms, echocardiograms, and stress tests. Some specialize in procedures such as angioplasty or treating abnormal heart rhythms.