Sinus rhythm does not indicate a heart problem. Sinus rhythm is a normal heart rate, and the medical term for a normal heartbeat rhythm is sinus rhythm. The normal sinus rhythm rate is 60-100 beats per minute, and infants and children beat slightly faster compared to adults. Sinus rhythm requires attention to both sinus bradycardia and sinus tachycardia, with sinus bradycardia occurring at less than 60 beats per minute and sinus tachycardia at more than 100 beats per minute. In case of occasional sinus bradycardia, the heart rate is not less than 50 beats per minute and no discomfort is felt, such as heavy heartbeat and palpitations, no treatment is usually needed. If sinus tachycardia occurs, it is usually caused by fever, anemia, or excitatory drugs, and is characterized by dyspnea and dizziness. It is recommended to visit the cardiovascular medicine department of a regular hospital or the direct emergency department in a timely manner when you feel the manifestation of dyspnea, dizziness and palpitations to avoid delaying the treatment.