Sinus rhythm is the normal, regular beating of the heart. Under normal circumstances, the heart rate of adults is between 55 and 100 beats per minute. So when is sinus tachycardia normal and when is it abnormal and does it need to be treated? First of all, we need to know that sinus rhythm is influenced by many factors, such as emotions, activities, body temperature and whether the body is in a state of disease, etc. Extra-cardiac diseases and cardiac changes can affect the frequency of sinus rhythm. If the sinus tachycardia is transient or caused by other factors such as activity or emotional excitement and returns to normal after rest, then it is not necessary to pay special attention to it, as it is normal and necessary for the body. If the tachycardia is constant and unrelated to physical activity and other factors, i.e. chronic inappropriate sinus tachycardia or chronic non-paroxysmal sinus tachycardia, it may require attention and further management. In some sedentary, inactive and obese people, they often have panic attacks with little or no activity, and when they check the ECG, they have sinus tachycardia. In such people, it is generally recommended to increase activity, especially aerobic exercise, and pay attention to weight control, and the gradual decrease of heart rate can be felt in a few weeks to a few months after regular physical exercise. In other words, sinus tachycardia can be controlled by some non-pharmacological treatments. Such people are not uncommon in the present life and work pattern, so I hope to get everyone’s attention to strengthen the plain physical exercise and improve the physical quality. Of course, chronic inappropriate sinus tachycardia can be controlled by choosing beta-blockers or certain calcium channel blockers under the aforementioned non-pharmacological treatment, and if the effect of drug control is not satisfactory, the application of catheter ablation techniques for sinus node improvement can be considered if necessary. Therefore, the need for treatment of sinus tachycardia requires consideration of various factors and a case-by-case analysis.