First of all, swollen lymph nodes may be caused by bacterial infection, which can stimulate lymphocytes and cause lymph nodes in the body to proliferate, resulting in swollen lymph nodes. Secondly, swollen lymph nodes may be caused by tuberculosis. When lymphatic nodules are not adherent to the tissues around the skin, the swollen nodules usually appear as a result of pus-like material around the nodules, resulting in swollen lymph nodes. In addition, swollen lymph nodes may also be caused by some chronic diseases in the body, such as breast enlargement and thyroid disease, which may also lead to lymphocyte lesions and stimulate lymphocytes to appear swollen. In conclusion, swollen lymph nodes are not necessarily tumors. There are many factors that cause swollen lymph nodes, and it is usually necessary to go to the hospital for detailed examination to confirm and take corresponding treatment measures under the guidance of doctors.