Low red blood cells during pregnancy mainly include physiological and pathological causes, regardless of which causes, low red blood cells during pregnancy may affect the health of pregnant women and fetal development, and require timely intervention and treatment in accordance with medical advice. Physiological: 1. Increased blood volume: During pregnancy, in order to maintain the growth and development of the fetus, the circulating blood volume increases, which can lead to a decrease in the level of red blood cells, resulting in physiological anemia in pregnant women; 2. Nutritional deficiency: During pregnancy, the demand for various nutrients increases, due to insufficient intake of iron, folic acid, vitamin B12 and other hematopoietic raw materials or absorption disorders, resulting in a decrease in hemoglobin synthesis, etc. This leads to anemia, and also low red blood cells. Second, pathological: clinically, it can also be due to certain diseases that cause a decrease in red blood cells during pregnancy, such as hypersplenism, leukemia, aplastic anemia, myelodysplastic syndrome and other conditions, which can lead to red blood cell deviation and require hospitalization. If a pregnant woman has low red blood cells, she needs to be evaluated comprehensively for the presence or absence of anemia symptoms, and also combined with hemoglobin, red blood cell ratio, and mean red blood cell volume in routine blood tests to determine what causes the anemia, and given appropriate medication and dietary guidance. Pregnant women with iron deficiency anemia are more likely to develop iron deficiency, so they can take oral iron supplements and pay attention to vitamin supplementation as prescribed by the doctor. Regular maternity checkups, review blood count, and adjust medication according to the effect of treatment.