4 Unknown reason or several echanisms Sideroblastic anemia Chronic disease anemias(chronic inflammation, infections,尿毒症 Hepatic disorders, neoplasm connective tissue disease. endocrine disorders)4 Unknown reason or several mechanisms Sideroblastic anemia Chronic disease anemias (chronic inflummation, infections, 尿毒症, Hepatic disorders, neoplasm, connective tissue disease, endocrine disorders)