Heart Palpitations Weakness Fatigue Lightheadedness Dizziness Confusion Shortness of breath Chest pain Fainting 
A hyperthyroidism Asthma Carbon monoxide poisoning Cardiomyopathy Chronic obstructive pulmonary disease (COPD) Congenital Heart defects Coronary artery disease Diabetes Effects of medications, caffeine, smoking, or alcoholism Heart attacks Heart valve disease High blood pressure Lung cancer or other lung diseases Pericarditis Pneumonia Previous heart surgery Pulmonary embolism Sick sinus syndrome Obstructive Sleep apnea Stress Viral infections 
Cardiologist
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