Enlarged lymph nodes that become smaller but do not go away may be caused by microbial infections or tumor diseases. 1. Bacterial, viral and other microbial infections can lead to enlarged lymph nodes, which become smaller after treatment but are not completely cured, and that is why they will always exist, especially after the formation of chronic lymphadenitis, the lymph nodes change with the infection, and their volume changes all the time, but they won’t be completely eliminated. 2. Lymph node enlargement caused by tumor disease. After conservative treatment or radiotherapy, the proliferation of tumor cells will be controlled, and the enlarged lymph nodes will become smaller, but they cannot be eliminated completely, so they will exist all the time, which is a normal manifestation of tumor diseases. It should be noted that when the above phenomenon occurs, one should go to the hospital in time for examination and treatment under the doctor’s guidance.