Swollen lymph nodes in the neck are mainly related to tonsillitis, pharyngitis, lymph node hyperplasia and other causes. 1. Tonsillitis: pathogens invade the tonsils and cause inflammation, which is part of the body’s immune system and can easily lead to swollen lymph nodes in the neck. 2. Pharyngolaryngitis: a common acute upper respiratory tract infectious disease, pathogens invade with the lymphatic system, thus causing swelling of lymph nodes in the neck. 3. Lymphadenitis: most common in bacterial infections, pathogens enter the lymphatic vessels causing inflammation of the lymph nodes, resulting in lymph node tissue hyperplasia, causing enlargement. Enlarged lymph nodes in the neck may also be related to other diseases, it is recommended to go to a professional hospital to clarify the cause of the disease and under the guidance of the doctor for further examination and treatment, so as to avoid delaying the condition.