Why my brother is having high pulse rate, his heart rate ranges from 100-122 bpm at resting also. His spo2 is 98% and currently does not feel any breathing issue or anything. Recetly he had some sore throat and itchy throat. No cough and no fever. Could you help me in this regard why his pulse rate is so much high. His age is 18 years. Does he have any heart condition?. I am very tensed about that. Or any other reason pulse rates are high?.