A cardiologist is a doctor who specializes in diagnosing and treating heart-related conditions. They focus on issues like heart disease, high blood pressure, and arrhythmias, which are irregular heartbeats. Cardiologists use various tests, such as echocardiograms and stress tests, to understand how well the heart is functioning and to determine the best treatment options. In addition to treating existing heart problems, cardiologists also work on preventing heart disease through lifestyle advice and regular check-ups. They often collaborate with other healthcare professionals to provide comprehensive care, ensuring that patients maintain a healthy heart and overall well-being.