• Bluish or grayish skin color (cyanosis)
• Large, rounded fingernails or toenails (clubbing)
• Easily tiring and shortness of breath with activity
• Shortness of breath while at rest
• Chest pain or tightness
• Skipped or racing heartbeats (palpitations)
• Dizziness or fainting
• Coughing up blood
• Numbness or tingling in fingers or toes
• Headaches