There are three main causes of anemia in pregnant women: First, insufficient intake: vomiting, indigestion, and partial eating during pregnancy may lead to a relative lack of iron, folic acid, and vitamin B12 in the patient. Second, excessive blood loss: If the patient has previous parasitic diseases, as well as previous excessive menstruation, peptic ulcers, or even hemorrhoids, etc., which cause a long-term chronic process of blood loss, it can lead to anemia in pregnant women. Third, increased demand during pregnancy: Because of the increased nutritional demand and rapid growth of the fetus and pregnant women during pregnancy, the amount of iron and folic acid needed during pregnancy are greatly increased compared to the amount needed before pregnancy, and failure to meet the demand will lead to anemia. If anemia is found during pregnancy, the cause of anemia should be clarified as soon as possible, and attention should be paid to iron supplements, folic acid, vitamin B12, etc. to promote the recovery of hematopoiesis.