Symptoms of the disease vary according to the severity of the congenital malformation of the heart and its effect on the performance of the heart muscle, and the following are some of the symptoms that a sick child may feel or appear:

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• Fatigue and exhaustion: When doing any effort, parents notice that their child cannot keep up with the rest of his classmates when playing or practicing physical sports.

• Shortness of breath: The child feels difficult to breathe, especially when exerting efforts, climbing stairs, or doing exercise, and parents may notice rapid breathing and fatigue.

• Increase the number of heartbeats: The child feels his heartbeat is strong and fast, and sometimes it is irregular. Parents notice this also, especially when placing the hand on the child's chest.

• Blue color: especially the lips, tongue and extremities, and this is usually in congenital heart anomalies accompanied by cyanosis.

• Recurrent chest infections: an example of this is pneumonia and frequent wet cough accompanied by sputum.

• Change the color of the nails and their swelling: it is noticed that the nails are deformed and enlarged and their shape may resemble the shape of a drum stick.

• Breastfeeding: It is observed in a nursing child accompanied by excessive sweating, difficult shortness of breath and the inability to complete feeding.

• Impaired growth: where the newborns notice that the child's weight is not gaining in the normal way required.

• Loss of consciousness: for short periods of time.

• The presence of an abnormal voice: or what is called (snuffing) or a murmur in the heart, and it is usually discovered when examining the child for any reason, and often the voice is benign and goes away automatically.

• Swelling of the body's organs: This is observed in severe cases of heart failure, due to the inability of the heart to pump blood as required.

• Chest pain and paleness.