 Symptoms of blood clots in the lungs include difficulty breathing, chest pain that worsens with a deep breath, or a cough, coughing up blood in a faster than normal or irregular heartbeat. Speak with a doctor about your risk for blood clots and seek medical attention if you have any symptoms. On average, one person in the United States dies of a blood clot every six minutes. Don't let that be you or someone you know. Stop the clot. Spread the word. Learn more at stoptheclot.org.