The normal range of the internal diameter of the aortic root in adults is 33-36mm in men and 28-32mm in women, and the normal range of the internal diameter of the pulmonary artery root is 12-26mm.Diseases related to the abnormal internal diameter of the aorta and the pulmonary artery include aortic constriction, aortic widening, pulmonary stenosis, and widening of the pulmonary artery. 1. Aortic constriction: when the inner diameter of the aorta is lower than the normal range, it is called aortic constriction. The cause of the disease is not yet clear, and it may be related to congenital developmental abnormality. In mild cases, there may be no obvious symptoms, but in serious cases, there may be headache, dizziness, tinnitus, blurred vision, palpitation, chest tightness and other symptoms, and even heart failure. 2. Aortic widening: the main causes are congenital developmental anomalies, hypertension, atherosclerosis, arteritis and so on. The disease may be asymptomatic in the early stage, but in severe cases, chest tightness, chest pain, and even aortic aneurysm rupture, arterial entrapment and other serious complications, with a very high mortality rate. 3. Pulmonary artery stenosis: generally caused by congenital cardiac developmental abnormalities, early chest tightness, shortness of breath, fatigue, late dyspnea, cyanosis, fainting and heart failure in severe cases. 4. Widening of pulmonary artery: the main cause of developmental abnormalities and pulmonary hypertension, the main symptoms are chest tightness and dyspnea. When you find abnormal aortic and pulmonary artery internal diameter, you must go to the hospital in time for a comprehensive examination to clarify the cause of the disease, and then choose the appropriate treatment plan according to the condition.