120 beats per minute is not normal, belongs to the tachycardia, may be caused by physiological or pathological factors, different causes, different effects. 1. Physiological: If the heart rate of 120 beats per minute is caused by drinking alcohol, emotional excitement, strenuous exercise and other behaviors, there is generally no particularly serious impact. Apart from these influencing factors, the heart rate will return to normal. 2. Pathological: hyperthyroidism, tachyarrhythmia and organic heart disease and other pathological diseases may also cause heart rate of 120 beats/minute, but long-term, it will make the heart load, resulting in heart failure. Hyperthyroidism can be treated with drugs such as methimazole, and heart disease requires timely examination in the hospital for electrocardiograms and other tests, and then treatment for the cause of the disease. The use of drugs under the guidance of a doctor.