Postoperative edema after thyroid surgery can be treated with local hot compresses if it is caused by poor blood circulation around the incision; anti-inflammatory drugs can be applied if it is caused by infection; and levothyroxine sodium tablets can be supplemented if it is caused by hypothyroidism. 1. Poor blood circulation around the incision after surgery will lead to tissue edema, but with the establishment of new blood vessels and improved blood circulation, the tissue edema will gradually subside. Physical therapy such as local hot compresses can be used to promote blood circulation in the area, which is conducive to the dissipation of edema. 2. If the edema has not been eliminated for a long time, it is recommended to go to the hospital to check whether there is an infection, and use anti-infective drugs under the guidance of the doctor, such as amoxicillin, levofloxacin and so on. 3. If there is double lower limb edema, accompanied by facial edema, and the FT3 and FT4 levels in the serum are decreased, and the TSH level is increased, then it is considered that the hypothyroidism is caused by the surgical injury. This kind of hypothyroidism is lifelong and requires long-term or even lifelong oral levothyroxine sodium tablets for replacement therapy. In conclusion, there are several possible causes of post-thyroid surgery edema, and it is important to be checked and treated under the supervision of your doctor.