The document discusses common cardiovascular diseases, defining them as conditions affecting the heart and blood vessels, which are crucial for blood circulation and overall body function. It highlights two major diseases: coronary artery disease (CAD), caused by plaque buildup that restricts blood flow to the heart, and congenital heart disease (CHD), involving structural defects present at birth. Treatments for these conditions include lifestyle changes, medications, and surgical interventions, emphasizing the importance of understanding heart health risks.