There are many causes of cervical lymph nodes, which clinically include the following diseases: 1. The most common is lymphadenitis caused by infections in the mouth, throat and upper respiratory tract. If the lymph nodes are soft and mobile, they can shrink or even disappear after controlling the primary disease and using antibiotics or antiviral treatment. 2. If a child has recurrent high fever and swollen lymph nodes in the neck after excluding lung and oral pharyngeal infections, he or she needs to be alert to the possibility of lymphoma and needs a lymphatic biopsy. 3. 4. For thyroid gland, lymph node metastasis in the neck is likely to occur at an early stage in the case of thyroid cancer, such as papillary or follicular carcinoma.