A loud fluttering heartbeat may be associated with anxiety disorders, high blood pressure, hyperthyroidism, heart disease and other causes. 1. Anxiety: Anxiety will make the sympathetic nerves excited, the adrenaline secretion level is abnormal, the autonomic nervous system disorder causes the heart rate to accelerate, the heart fluttering symptoms. 2. Hypertension: due to high blood pressure in hypertensive patients, resulting in excessive pressure load on the heart, myocardium ischemia and hypoxia, triggering a faster heart rate, heartbeat sound big fluttering. 3. Hyperthyroidism: due to hyperthyroidism, the thyroid hormone synthesis and secretion increase, the basal metabolic rate accelerated, causing heart excitement, heart rate will be too fast, chest tightness, shortness of breath, heart fluttering symptoms. 4. Heart disease: heart fluttering jump, may be due to heart disease, arrhythmia, due to increased burden on the heart, should be timely electrocardiogram, to exclude organic heart disease. If the heartbeat sound big fluttering fluttering, the symptoms continue to be unrelieved, should promptly seek medical attention, identify the cause of the disease, symptomatic treatment.