A 17 mm diameter lymph node is already a relatively large lymph node, which can be palpated clinically. In this case, first of all, it is necessary to clarify what is the etiology of the enlarged lymph nodes. The most common one in clinical practice is soft tissue inflammation around the lymph nodes. In this case, it is necessary to determine whether the patient has any local skin redness, swelling, heat, pain or generalized fever symptoms, and if there are similar infection symptoms, anti-infection treatment is required. Also enlarged lymph nodes should be alerted to the possibility of malignant tumor, and lymph node biopsy can be performed to determine this.