Most congenital heart diseases are detected in childhood, but some, such as atrial septal defect, can remain undiagnosed until adulthood. In the first part of this review, taking the auscultation findings and the clinical picture as a basis, the diagnosis of four common congenital heart diseases is discussed: ventricular septal defect, pulmonary stenosis, patient ductus arteriosus, and atrial septal defect. In addition, the latest developments in the field of therapy are briefly considered.