After thyroid surgery, the appearance of swollen lymph nodes in the neck may be caused by lymph node metastasis or inflammatory reaction of skin and soft tissue infection. 1. Lymph node metastasis: usually seen in thyroid cancer, such as papillary thyroid cancer and follicular thyroid cancer. 2. Inflammatory reaction of skin tissue infection: Wound infection may occur after thyroid surgery, resulting in peripheral lymphitis of the neck, which may cause lymph node enlargement. In addition, diseases of the primary lymphatic system, such as lymphoma, should be considered. If you find enlarged lymph nodes in the neck, it is recommended to go to a regular hospital for a clear diagnosis and treatment under the professional guidance of a doctor. Normally, you should pay attention to rest, drink more water, and avoid eating spicy and stimulating food.