Anemia 73 is a moderate form of anemia and is relatively severe. Anemia is a series of clinical syndromes caused by a decrease in red blood cells in the peripheral blood of the human body, which fails to adequately oxygenate tissues and organs when it falls below the lower limit of the normal range. The severity of anemia can be classified into mild, moderate, severe, and very severe anemia according to the hemoglobin concentration. 1. Mild anemia: hemoglobin concentration >90g/L, but less than normal. 2. Moderate anemia: hemoglobin concentration 60-89g/L. 3. Severe anemia: hemoglobin concentration 30～59g/L. 4. Very severe anemia: hemoglobin concentration <30g/L. Anemia is a class of clinical syndromes, anemia caused by different causes of disease and prognosis are very different, such as most of the iron-deficiency anemia supplementation of iron hemoglobin can return to normal faster, while the anemia caused by acute leukemia is more serious, and requires active treatment to obtain a longer survival period. Anemia hemoglobin 73 for moderate anemia, can be caused by iron deficiency anemia, leukemia, aplastic anemia and other diseases, relatively more serious, need to consult a doctor in a timely manner, targeted treatment.