Generally speaking, anemia occurs with blood loss of about 500 ml, and severe anemia occurs with blood loss of about 1,000 ml. Depending on the rate of blood loss hemorrhagic anemia is classified as acute and chronic, depending on the amount of blood loss hemorrhagic anemia is classified as mild, moderate, or severe, and depending on the etiology of the blood loss hemorrhagic anemia is classified as hemorrhagic and non-hemorrhagic disorders. Routine blood tests can determine the presence or absence of anemia. The most common symptom of anemia is generalized weakness, and other clinical conditions vary depending on the etiology, the degree of decrease in the oxygen-carrying capacity of the blood, the degree of decrease in blood volume during anemia, the rate at which anemia occurs, and the ability of each system to compensate for and tolerate the anemia. The immediate treatment for acute blood loss is hemostasis, restoration of blood volume and anti-shock, of which blood transfusion is the fastest way to restore blood volume. Chronic blood loss is treated by actively treating the primary disease, such as gynecological disease in cases of heavy menstruation. If there are clinical signs of blood loss, it is recommended to consult a doctor in time to avoid serious consequences.