Causes of chronic anemia include chronic infections, malignant neoplastic diseases, renal diseases, liver diseases, and hematopoietic material deficiency diseases. 1. Chronic infections: such as tuberculosis, parasitic diseases, etc., especially infectious diseases lasting for more than 1 to 2 months, can lead to chronic anemia. 2. When there is malignant neoplastic disease, malignant depletion can occur, leading to chronic anemia. 3. Renal diseases: such as chronic renal insufficiency, can cause erythropoietin deficiency, and lead to chronic anemia. 4. Liver diseases: such as hepatitis, liver cirrhosis, liver malignant tumor and other diseases, which can lead to abnormal erythrocyte metabolism, abnormal erythrocyte membrane lipids and so on, thus causing chronic anemia. 5. Hematopoietic raw material deficiency diseases: when the body lacks iron ions, vitamin B₁₂, folic acid and other substances, chronic anemia can be caused. Suffering from chronic anemia, need to seek early medical treatment, follow the doctor’s instructions for systematic treatment, medication under the guidance of physicians.