Painless and mobile swollen lymph nodes may be caused by lymph node inflammation, lymphatic metastasis, lymphoma, immune diseases and so on. 1. Lymph node inflammation: this disease is mainly related to bacterial infection. Some patients may not have any other symptoms, only manifested as enlarged lymph nodes, some patients do not have obvious pain, can be moved, especially chronic lymphadenitis, often pain is not obvious. 2. Lymphatic metastasis: some malignant tumors in the body, such as thyroid cancer, lung cancer, breast cancer, etc., can be transferred to lymph nodes through lymphatic metastasis, resulting in enlarged lymph nodes, which usually do not accompany with pain, and the lumps are firm and hard, which can be pushed away in the early stage, and are prone to fusion. 3. Lymphoma: this disease is a malignant tumor of lymphohematopoietic system, the clinical manifestation is painless enlargement of lymph nodes, and some patients’ early enlarged lymph nodes can be moved. 4. Immune diseases: such as systemic lupus erythematosus, tuberculosis, etc., there may also be part of the lymph node invasion, resulting in painless enlargement of the lymph nodes, which is usually mobile. When you find that the lymph nodes are enlarged, painless and mobile, you need to go to the hospital in time for examination, to clarify the cause of the disease, and then follow the doctor’s instructions to be targeted treatment.