Heart diseases refer to a range of conditions that affect the heart's structure and function. Common types include coronary artery disease, which narrows the arteries supplying blood to the heart, and heart failure, where the heart cannot pump blood effectively. Risk factors include high blood pressure, high cholesterol, and lifestyle choices like smoking and poor diet. Preventing heart diseases often involves maintaining a healthy lifestyle. Regular exercise, a balanced diet rich in fruits and vegetables, and avoiding tobacco can significantly reduce risks. Regular check-ups with a healthcare provider can help monitor heart health and catch any issues early.