Lymphocyte 17 may refer to 17%, which is low and may be due to bacterial infection, long-term use of glucocorticoids, leukemia and other factors. 1. Bacterial infection: neutrophils will increase in bacterial infection, bone marrow neutrophil hyperplasia will increase, lymphocytes will be relatively reduced, and there is no serious problem, after dealing with bacterial infection, the lymphocyte ratio tends to be normal. 2. Long-term use of glucocorticoids: Long-term use of glucocorticoids to suppress the immune system may lead to bone marrow proliferation dysfunction, triggering low lymphocytes. 3. Leukemia: In case of acute granulocytic leukemia, abnormal proliferation of granulocytes in the bone marrow will inhibit the proliferation of other cells, causing a decrease in lymphocytes and other ratio indicators. Lymphocytes are 17% low, there may be other reasons, it is recommended to consult a doctor in time to find out the reasons, the above drugs need to be used under the guidance of a physician.