Swollen submandibular lymph nodes are usually caused by soft tissue infections, such as secondary infections from surrounding cysts, or viral infections, etc. Anti-inflammatory treatment or anti-viral treatment should be given, and during the treatment period, attention should be paid to drinking more water and eating a light diet, and the swollen lymph nodes will usually disappear on their own after the viral or bacterial infection subsides. If the swollen submandibular lymph nodes do not disappear, local physiotherapy, such as hot compresses, can improve blood circulation and promote the swelling of lymph nodes. In addition, swollen lymph nodes may also be caused by tumors, such as lymphoma, various types of acute and chronic leukemia, tumor metastases, plasma cell tumors, etc., and may also be reactive hyperplasia. Therefore, it is advisable to go to the hospital for corresponding examinations, such as puncture examination and pathological biopsy, in order to clarify the causes of swollen lymph nodes to exclude malignant lesions and, if necessary, to remove them surgically. However, patients should be clear that the swollen lymph nodes can subside, but the lymph nodes will not disappear.