Congenital heart disease in mild cases may have no specific symptoms, depending on the degree of recurrence of the malformation and age. The growth and development are normal, and only a rough and loud murmur is found in the left chest during physical examination. Common clinical manifestations include: Cyanosis: Cyanosis is a prominent manifestation of cyanotic congenital heart disease (e.g., large vessel dislocation, tetralogy of Fallot, etc.). It can persist after birth or become apparent gradually three to four months after birth, and is most obvious in the lips of the mouth, the nail beds of the fingers (toes), and the tip of the nose. In contrast, latent cyanotic heart disease (such as ventricular septal defect, atrial septal defect, arteriovenous ductus arteriosus) usually does not have cyanosis, but only appears when moving, crying, breath-holding or suffering from pneumonia, and persistent cyanosis can appear in late stage when pulmonary hypertension and right heart failure occur. Heart murmur: Most congenital heart disease can be heard as a murmur, which is relatively loud and rough and can be accompanied by tremor in the anterior chest area in severe cases. Most heart murmurs are detected by the physician at the time of the visit. Some normal children may have a physiological murmur. Poor physical strength: Due to poor cardiac function, insufficient blood supply and hypoxia, children with severe disease have feeding difficulties in infancy, stopping after a few sips, shortness of breath, easy vomiting and profuse sweating, and prefer to be held vertically. Older children are reluctant to move, prefer to squat, easily fatigued after activity, paroxysmal respiratory distress, severe hypoxia often suddenly faint when nursing, crying or defecating, prone to heart failure. Prone to respiratory infections: congenital heart disease with left-to-right shunt due to increased pulmonary blood. The two are often the cause and effect of each other and become the cause of death in congenital heart disease poor development: congenital heart disease mostly has stunted development, especially in those with cyanosis, and in severe cases the intellectual development may also be affected. In addition, congenital heart disease such as enlarged left atrium or pulmonary artery compression of the recurrent laryngeal nerve. In addition, congenital heart disease with enlarged left atrium or pulmonary artery compressing the laryngeal nerve may cause hoarse crying, shortness of breath and coughing since childhood. The enlargement of the ventricles may lead to augmentation of the precordial area and thoracic deformity; persistent cyanosis may be accompanied by pestle finger, which usually develops 1 to 2 years after the appearance of cyanosis.