Cardiac and respiratory symptoms that may occur along with cyanosis
1. Chest pain
2. Difficulty breathing
3. Leaning forward when sitting to breathe more easily
4. Rapid breathing (tachypnea) or shortness of breath
5. Use of rib cage muscles in an attempt to breathe more easily
6. Squatting (young children)

Other symptoms that may occur along with cyanosis
1. Confusion or loss of consciousness for even a brief moment
2. Enlargement of the skin beneath the nail beds (clubbing)
3. Fever
4. Irritability, fussiness, poor feeding, and poor sleeping in infants and young children
5. Lethargy
6. More frequent headaches than you typically have

Serious symptoms that might indicate a life-threatening condition
1. Bluish coloration of the skin, fingernails, or mucous membranes
2. Chest pain
3. Confusion or loss of consciousness for even a brief moment
4. Difficulty breathing
5. Lethargy
6. Limpness or lethargy