Swollen lymph nodes in the neck may be caused by immune system diseases, inflammatory diseases or tumor diseases. 1. Immune system disorders: mild immunocompromise, the body is susceptible to infections, which may cause lymph node enlargement, such as systemic lupus erythematosus, tuberculosis and so on. Therefore, regular blood tests and other related tests are needed. These diseases generally need to be treated with glucocorticoid drugs. 2. Inflammatory diseases: the most common cause of enlarged lymph nodes in the neck is inflammation of the oral cavity, maxillofacial and neck, such as gingivitis, pharyngitis, tonsillitis and so on. In addition, cervical lymphatic tuberculosis can also lead to enlarged lymph nodes. 3. Neoplastic diseases: Neoplastic diseases can also lead to enlarged lymph nodes in neck, such as lymphoma, leukemia, laryngeal cancer, thyroid cancer, lung cancer and malignant tumors in digestive tract, etc., which can lead to enlarged lymph nodes in neck through lymphatic metastasis. When the patient has abnormal neck lymph node swelling, it is recommended to consult a doctor in time for examination and choose targeted treatment after clarifying the cause.