Most people’s heart rhythm belongs to the sinus, the normal sinus rhythm, no need for treatment, only when the sinus rhythm is too fast or too slow, there may be clinical symptoms, usually manifested as fatigue, dyspnea, dizziness or nausea, etc., and need to go to cardiovascular department consultation and treatment. There are many reasons for sinus arrhythmia, mainly divided into pathological factors and physiological factors, physiological factors are likely to take stimulant drugs or drink tea and lead to sinus rhythm exceeds the upper limit, generally more than 100 times per minute is too fast for adults, in addition, too much physical exercise may also lead to fast heart rhythm, this situation, is no need for treatment; leading to sinus tachycardia pathological factors include Tachycardia pathologic factors include hypotension, intermittent hypoxia, cardiac function abnormalities, and hyperthyroidism, clinically more common is hyperthyroidism, sinus tachycardia caused by too much thyroid hormone, need to go to the endocrine specialists for treatment, as for the other conditions, you need to be targeted treatment. In short, sinus tachycardia or too slow belongs to the disease, if once the patient palpitations, chest tightness, shortness of breath, need to pay attention to, should pay attention to improve physical fitness on weekdays.