Coronary heart disease (CHD) What is coronary heart disease? Coronary heart disease is when the arteries supplying blood to your heart become narrowed or blocked. What you can do to reduce your risk Find out how you can reduce your risk of getting coronary heart disease. What you can do to take care of yourself Things you can do to manage your heart condition and reduce the risk of it getting worse. Coronary heart disease support and advice Support and advice to help you self-care and manage your coronary heart disease.