For some people, signs or symptoms of congenital heart disease aren't noticed until adulthood. Symptoms may return years after a congenital heart defect is treated. Common congenital heart disease symptoms in adults include: 
Irregular heart rhythms (arrhythmias)
Blue skin, lips and fingernails (cyanosis)
Shortness of breath
Feeling tired very quickly with activity
Swelling of body tissue or organs (edema)
