There are no studies that clearly show that a slow heart rate causes high hemoglobin. The normal range for heart rate is 60 to 100 beats per minute, with slower heart rates below 60 beats. Normal hemoglobin values are 110-150 g/L for women and 120-160 g/L for men. There are three common factors that contribute to high hemoglobin. The first is relatively high due to loss of water from the plasma, such as severe vomiting, extensive burns, severe diarrhea, and profuse sweating. The second type is hypoxia, such as residents of plateau areas, pulmonary heart disease and chronic obstructive pulmonary disease that are chronically hypoxic. The third type is blood system diseases, such as true erythrocytosis. There is no study that shows a direct causal relationship between slow heart rate and high hemoglobin. It is recommended to consult a doctor to complete the relevant examinations in order to clarify the cause of high hemoglobin and receive standardized diagnosis and treatment according to the doctor’s instructions.