There are two types of lymph nodes in the neck: the first is in the location of the thyroid gland; the second is in the place behind the lateral sternocleidomastoid muscles bilaterally. If there are granular nodes in that place and there is pain when pressing, the mobility of these nodes is better and the boundary is clearer, it is initially considered to be caused by local lymph node enlargement. The common cause is acute upper respiratory tract infection, such as acute pharyngitis, acute tonsillitis or bronchitis, which leads to swollen lymph nodes. In addition, it may be caused by nasopharyngeal or thyroid malignant tumor, which may cause swollen nodes through lymphatic metastasis.