Mild congenital heart disease usually does not show obvious symptoms. Some people may have chest tightness, chest pain, shortness of breath, dizziness and cyanosis after strenuous activities, which are related to the type of congenital heart disease. Patients with mild left-to-right shunt congenital heart disease may be asymptomatic, and after strenuous activity, patients may experience chest tightness, shortness of breath, and chest pain. Patients with congenital heart disease with a mild right-to-left shunt may have symptoms such as generalized cyanosis. Patients with mild congenital heart disease without shunt may have symptoms such as dizziness due to insufficient ejection of blood from the heart. When you find discomfort or aggravation of the condition, it is recommended to go to the hospital in time for a clear diagnosis, and choose the appropriate treatment plan under the guidance of the doctor according to the physical condition.