The causes of elevated ferritin include: a. Malignant tumors, patients with elevated ferritin due to increased synthesis of ferritin by tumor cells, commonly seen in acute leukemia, lymphoma, liver cancer, lung cancer, pancreatic cancer and other malignant tumors. Second, some liver diseases due to liver metabolism of ferritin dysfunction, ferritin clearance is reduced and cause ferritin elevation, common in liver cirrhosis, viral hepatitis, etc. Third, long-term blood transfusion, such as thalassemia, aplastic anemia, myelodysplastic syndrome patients need long-term intermittent blood transfusion. If no timely de-ironing treatment is performed, it can also cause elevated ferritin. Fourth, seen in acute infections, autoimmune system diseases, such as rheumatoid arthritis patients will also appear elevated ferritin.