Low red blood cells during pregnancy, mainly including physiological and pathological reasons, regardless of which cause, low red blood cells during pregnancy may affect the health of pregnant women and fetal development, the need for timely intervention and treatment in accordance with medical advice. Physiological: 1, increased blood volume: during pregnancy, in order to maintain fetal growth and development, circulating blood volume increases, which can lead to a decrease in the level of red blood cells, resulting in physiological anemia of pregnant women; 2, nutritional deficiencies: pregnant women in the process of pregnancy on a variety of nutrients increased demand, due to iron, folic acid, vitamin B12 and other blood raw materials such as insufficient intake or absorption disorders resulting in reduced hemoglobin synthesis, resulting in anemia, may also appear in red blood cells. This will lead to anemia and low red blood cells. Second, pathological: clinically, it can also be due to certain diseases, causing red blood cell decline during pregnancy, such as hypersplenism, leukemia, aplastic anemia, myelodysplastic syndromes and other conditions, can lead to red blood cell deviation, requiring hospitalization. If a pregnant woman develops low red blood cell deviation, it is necessary to comprehensively assess whether there are symptoms of anemia, and also combine hemoglobin, red blood cell specific volume and average red blood cell volume in routine blood tests to determine what kind of anemia is caused, and to give appropriate medication and dietary guidance. Pregnant women are more likely to develop iron deficiency anemia, which can be treated with oral iron supplements and vitamin supplements as prescribed by the doctor. Regular obstetric examination, review the blood routine, according to the effect of treatment, adjust the medication.