The most common killer of heart disease is coronary artery disease (CAD). This condition is caused by a buildup of plaque in the coronary arteries, which supply oxygenated blood to the heart. Over time, the plaque can narrow or block the arteries, leading to decreased blood flow to the heart. This can cause chest pain, shortness of breath, heart attack, and even death. Risk factors for CAD include high blood pressure, high cholesterol, diabetes, smoking, obesity, and a sedentary lifestyle. Treatment for CAD may include lifestyle changes, medications, and/or surgery. Lifestyle changes may include exercising, quitting smoking, eating a healthy diet, and managing stress. Medications may include cholesterol-lowering drugs, blood pressure and blood sugar medications, and aspirin. Surgery may include angioplasty, stents, or bypass surgery. It is important to recognize the signs and symptoms of CAD and seek medical attention if symptoms occur. Taking steps to reduce the risk factors of CAD can help reduce its prevalence and save lives.