All diseases in cardiology to the late stage, if poorly controlled it will lead to heart enlargement and cardiac decompensation. Then these causes include coronary heart disease, myocardial ischemia, especially patients with myocardial infarction, the details are as follows: 1, because patients with myocardial infarction occur ischemic necrosis of the myocardium, this part of the necrotic myocardium is repaired by fiber repair not by cardiomyocyte repair, so this fiber does not have contractility, so this part of the population may not be treated in a timely manner, the vascular opening is relatively late treatment of drugs also did not do a reasonable addition to use. 2, there are some people who have chronic myocardial ischemia and angina pectoris, and there are problems with multiple blood vessels, and no appropriate treatment is done, so long-term chronic myocardial ischemia can lead to heart enlargement; heart enlargement will inevitably lead to recurrent heart failure, and this treatment requires active diagnosis and treatment of coronary heart disease, and if the stenosis is very serious, stenting can be done. This treatment requires active diagnosis and treatment of coronary heart disease, if the stenosis is very serious, stenting can be done to improve myocardial ischemia, in addition to some drugs to improve heart enlargement and prevent heart enlargement to delay the occurrence of heart enlargement; so we are required to follow the doctor’s instructions to take to improve myocardial remodeling and prevent heart enlargement; 3, hypertension, if not well controlled for a long time, can also cause hypertrophy of the heart, heart enlargement leads to heart failure; 4, cardiomyopathy, myocarditis, all diseases that cause All diseases that cause myocardial damage can cause heart enlargement and cardiac insufficiency at a later stage, so reasonable treatment should be carried out early among these people, and the maximum dose of drugs that the patient can tolerate should be taken to avoid heart enlargement and even further enlargement leading to the recurrence of heart failure. Therefore, heart enlargement should not be underestimated, and it is necessary to go to the hospital as soon as possible and timely to find a regular doctor to add reasonable drugs or even to do intervention to prevent further deterioration.