A fast heartbeat that resumes in paroxysms of more than ten seconds may be physiologic, or it may be caused by heart disease and other underlying conditions. Normal heart rate is 100~150 beats per minute. Physiological causes of fast heart rate can be smoking, drinking tea, exercise and excitement. Usually, fast heartbeats caused by such factors do not require special treatment. Avoid these factors and the heart rate will naturally return to normal soon. Heart conditions such as heart failure and myocarditis can also cause a fast heartbeat and should be treated appropriately. Heart failure is treated with high-flow oxygen, sitting position, diuretics such as furosemide, angiotensin-converting enzyme inhibitors such as captopril, and vasodilators such as nitroglycerin. There is no specific treatment for myocarditis, and antiviral therapy such as amantadine should be administered. The presence of heart failure is treated as it is. Fever, anemia and hyperthyroidism can also cause a fast heartbeat. Fever can be treated with antipyretics, anemia can cause a rapid heart rate, anemia can be corrected with supplementation of hematopoietic materials or promotion of bone marrow hematopoiesis and blood transfusions, and hyperthyroidism can be treated with a beta-blocker, such as propranolol, which can be very effective in restoring the heart rate to normal.