There are more reasons for the development of low red blood cells in pregnant women. When there is low red blood cells, it is recommended to go to the hospital for examination and timely improvement after understanding the causes. The specific reasons are as follows: 1, physiological factors: due to the increase in blood volume during pregnancy, but the number of red blood cells remains unchanged, blood is diluted, which can easily cause red blood cell reduction; 2, iron deficiency: iron is an important raw material for red blood cell synthesis, the demand for iron increases significantly after women become pregnant, and more iron is needed to synthesize hemoglobin and increase the amount of blood. A part of iron is also used to meet the needs of fetal development, so it is easy to lack iron, resulting in iron deficiency anemia. In the daily diet, you should eat more iron-rich foods appropriately; 3. Lack of folic acid: lack of folic acid leading to low red blood cells is also more common, because folic acid is involved in the production of red blood cells and aids in hematopoiesis. In the daily diet, you should eat more folic acid-rich foods, or take folic acid tablets after consulting your doctor, etc.; 4, pathological factors: pregnant women have chronic diseases or other conditions before pregnancy, such as stomach disease or parasitic diseases in the intestines, which cause low red blood cells. In summary, low red blood cells in pregnant women can be seen in physiological causes, iron deficiency, folic acid deficiency and some pathological causes, among which iron deficiency is more common. Therefore, pregnant women should pay special attention to iron supplementation during pregnancy.