The heart is one of the body’s most important organs. When it’s not functioning properly, you might need to see a cardiologist. These doctors specialize in diagnosing, monitoring and treating heart conditions. The work of a cardiologist can be as simple as providing diet and exercise recommendations or as complex as prolonging your life by transplanting a new heart into your body. Because heart conditions have different causes, one of the most important things that a cardiologist does is diagnose why your heart isn’t functioning as it. To identify the causes of your heart problems, cardiologists perform or order tests that measure your blood pressure, the health of your arteries and various imaging scans of the components ech your cardiovascular. Only invasive cardiologists perform surgical procedures, such as implanting pacemakers or doing heart transplants. Cardiologists need to complete at least a bachelor’s degree and then medical school.