Usually, high hemoglobin is not too abnormal. However, there is a kind of blood system diseases, such as true erythrocytosis is a kind of blood system diseases with abnormal increase of red blood cells, hemoglobin significantly increased as the manifestation of the blood system diseases, this kind of disease patients blood viscous, easy to induce thrombosis, the consequences are serious. Therefore, for true erythrocytosis, it should be actively treated to inhibit the proliferation of red blood cells, so as to control the role of hemoglobin. Other causes of elevated hemoglobin include blood loss and inflammation, which need to be identified.