Lymph nodes are an immune organ in the body and are found in every part of the body, also concentrated in the neck, groin, etc. They do not disappear. However, swelling of lymph nodes may occur when they become infected due to certain factors. There are many causes of swollen lymph nodes, which may include acute and chronic inflammation caused by pathogenic microorganisms such as bacteria, viruses, rickettsiae, etc.; lymphoma, various types of acute and chronic leukemia, multiple myeloma, and tumor metastasis; necrotizing proliferative lymphadenopathy, systemic lupus erythematosus, lipid deposition disease, nodular disease, etc. Therefore, the causes of swollen lymph nodes are mostly caused by organic diseases, which need to be treated for related diseases, otherwise they cannot disappear by themselves. It is recommended to go to a regular hospital for examination in time to clarify the cause and then carry out regular treatment. Local lymph node swelling can be treated with local heat compresses or antibiotics. If lymph nodes are swollen in multiple places, malignant tumors should be excluded, and then symptomatic treatment should be carried out under the guidance of a doctor.