Enlarged lymph nodes after thyroid cancer surgery are not necessarily recurrence, but may also be caused by inflammation. In some patients, if the lymph nodes are not cleared thoroughly during thyroid cancer surgery, and the lymph nodes are found to be enlarged after surgery compared with the previous ones, it can be considered as a recurrence of thyroid cancer lymph nodes. Once the diagnosis is confirmed, it is necessary to decide whether to undergo surgical treatment again according to the situation. Having enlarged lymph nodes after thyroid cancer surgery is not necessarily a recurrence, but can also be caused by inflammation. Inflammatory reaction can also lead to swollen lymph nodes, and relevant tests such as routine blood tests can be done to determine whether the lymph nodes are swollen due to inflammation. If the patient has lymph node swelling after thyroid cancer surgery, it is recommended to go to the hospital as soon as possible to improve the ultrasound, puncture biopsy and other related examinations, to clarify the cause of the disease and active treatment.