Possible causes of multiple swollen lymph nodes in the neck include: cervical lymphadenitis, lymph node tuberculosis, lymphoma, lymph node metastasis of malignant tumors and so on. 1. Cervical lymphadenitis: cervical lymphadenitis is the result of the spread of infection foci in surrounding tissues, such as gingivitis, oral mucositis, tonsillitis, etc. Generally, the enlarged lymph nodes can subside on their own after the primary infection foci are controlled. 2. Lymph node tuberculosis: lymph node is one of the parts easily invaded by tuberculosis bacillus, cervical lymph node tuberculosis is mostly caused by tuberculosis bacillus invading through oropharynx, most of them are painless lymph node enlargement, and lymph nodes can be fused with each other to form lumps in the late stage. 3. Lymphoma: Lymphoma is a malignant tumor originated from lymphatic tissues, which can be caused by superficial lymph nodes, manifested as progressive enlargement of lymph nodes in the neck, armpit, groin and other parts of the body without pain, and can be accompanied by low-grade fever, itchy skin and other symptoms. 4. Lymph node metastasis of malignant tumors: Neck lymph nodes are easy to be metastasized by many malignant tumors, such as nasopharyngeal carcinoma, thyroid carcinoma, lung carcinoma, etc. If there is a history of malignant tumors with unexplained enlargement of multiple lymph nodes in the neck, metastasis should be suspected. It is recommended to go to the hospital as soon as possible to clarify the nature of multiple swollen lymph nodes in the neck and treat it accordingly.