An adult pulse rate of 120 beats/minute is normal when measured after strenuous exercise and after drinking alcohol. A normal infant’s pulse is 120-140 beats/minute, so a pulse rate of 120 beats/minute in an infant is also normal. An adult pulse rate of 120 beats/minute in a calm state is abnormal and is considered tachypnea. A variety of circumstances can lead to abnormal pulse rate, should be analyzed specifically. 1. Physiological factors: such as strenuous exercise, emotional excitement, drinking alcohol, coffee, etc. can lead to abnormal pulse rate, which can cause an increase in pulse rate. The pulse rate of infants and young children can be up to about 130 beats/minute, so the pulse rate of 120 beats/minute is normal for infants. No treatment is needed if there is no discomfort. 2. Pathologic factors: Normal adult pulse rate is 60-100 beats/min. When calm, an adult pulse of 120 beats/min is abnormal and is considered tachypnea. Causes of tachypnea include anemia, hyperthyroidism, heart disease such as coronary artery disease, infective endocarditis, etc., which need to be actively treated. If the patient has panic, found that the pulse rate increases and other abnormalities, please consult the doctor in a timely manner, complete the relevant examinations, and follow the doctor’s instructions to standardize the treatment.