The duration of neck swelling after thyroid surgery depends on the nature of the patient’s thyroid lesion, the size of the surgical trauma, whether the postoperative trauma is accompanied by effusion, incisional infection and other complications: 1. At this time, the incision will be obviously swollen and painful, which needs to be treated by active anti-infection treatment and enhanced drug exchange, and the swelling of the neck will gradually subside in about 7 days. 2. If the incision heals well after surgery and there is no infection or fat liquefaction, the neck swelling can gradually subside after 2-3 hours after surgery.