Hemoglobin 270 is a hemoglobin concentration of 270 g/L, which is above the normal range and is abnormal. Common causes include hypoxia, true erythrocytosis, and massive burns. 1. Hypoxia: Long-term residence in the plateau of the population can lead to increased concentration of red blood cells and hemoglobin. This is a physiologic cause and generally does not require special treatment. 2. True erythrocytosis: due to the clonal chronic bone marrow proliferation of hematopoietic stem cells, resulting in an increase in red blood cells and a corresponding increase in hemoglobin concentration. 3. Massive burns: the decrease in blood volume leads to a relative increase in red blood cell content and a corresponding increase in hemoglobin concentration. There may be other reasons for elevated hemoglobin concentration, such as chronic obstructive pulmonary disease. When more than the normal range is not normal, need to improve its timely examination to clarify the cause of the disease, under the guidance of the doctor standardized treatment.