If the lymph nodes of patients with thyroid cancer are swollen, radiotherapy or microwave physiotherapy can be used to reduce the swelling. If patients with thyroid cancer have swollen lymph nodes, most of them are caused by postoperative lymph node hyperplasia, or it may be caused by metastasis of thyroid cancer. For the swollen lymph nodes caused by metastasis, radiotherapy can be used to eliminate the symptoms of swollen lymph nodes. For patients with thyroid cancer, if only the local reaction shows the phenomenon of enlarged lymph nodes after surgery, patients can use microwave physiotherapy to let the enlarged lymph nodes gradually reduce the swelling and return to normal. Thyroid cancer is relatively harmful, so it is suggested that patients should choose regular hospitals and under the guidance of doctors to carry out treatment scientifically.