The enlargement of the right ventricle is more serious because it has already developed heart failure. It is difficult for the right ventricle to enlarge unless there is a serious lung disease, such as pulmonary hypertension or pulmonary stenosis, when the right ventricle gradually becomes enlarged due to an increase in the pumping resistance of the right ventricle. Once the right ventricle is enlarged, the clinical symptoms of the patient will be obvious, with significant swelling of the lower extremities and difficulty in breathing. If a patient with right ventricular enlargement has the above symptoms, it indicates a very serious disease, but if the right ventricular enlargement is relatively mild, only slightly enlarged, and the patient has mild or no clinical symptoms, it indicates that it is not very serious, but the cause of the right ventricular enlargement should also be found.