Hemoglobin concentration of 166 should be treated according to the specific cause. Common causes include physiological and pathological factors, and treatments may include proper rest, drinking water or treating the original disease. The normal value of hemoglobin concentration is 120~160g/L for men and 110~150g/L for women. Hemoglobin concentration of 166g/L indicates a mildly high hemoglobin concentration, and the causes of high hemoglobin include physiological and pathological factors. 1. Physiological factors lead to hemoglobin elevation, such as strenuous exercise, sweating, drinking water, etc., mostly due to blood concentration, through appropriate rest, increase the amount of water to make hemoglobin down to normal. 2. elevated hemoglobin concentration caused by pathological factors, such as true erythrocytosis, uremia, severe diarrhea, etc., need to treat the primary disease, pathological factors can be corrected, hemoglobin concentration can be reduced to normal. Physiological factors are generally caused by rest, increase water intake, hemoglobin concentration can be normalized. If the hemoglobin concentration continues to rise, it is necessary to consider the pathological factors, and it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.