A heart rate of 90 beats per minute is usually normal, but this heart rate may be abnormal in the case of elderly people or patients with poor heart function. It should be clear that heart rate refers to the number of heartbeats per minute in a person’s resting state, and it is not standard to test heart rate if you have just finished exercising, when it is higher. The normal heart rate for adults is 60-100 beats/min, if the usual heart rate has been in the 90 beats/min, while there is no other physical discomfort, then this heart rate is basically normal. However, if the heart rate has been low in the past, for example, around 60 beats/min, and then suddenly it rises to 90 beats/min, it is important to pay attention to the possible existence of hyperthyroidism, anemia and other diseases, which need to be examined in the hospital to clarify the cause and treat the symptoms. For adults, a heart rate of 90 beats per minute is generally normal. However, if there are symptoms of discomfort, you should go to the hospital for a timely examination to rule out the possibility of disease. At the same time, you should also pay attention to maintain a good lifestyle, avoid staying up late, alcohol and other bad habits.