The presence of enlarged lymph nodes in the neck of about 11 millimeters may be serious. Most of the lymph nodes that appear enlarged in the neck are inflammatory lymph nodes and a small percentage are lymphoma or metastatic cancer of the lymph nodes. Usually, different treatment plans are taken according to different causes of enlarged lymph nodes. 1. Inflammatory lymph nodes: Lymph nodes are soft, with clear borders and no pressure pain. Most of the lymph nodes will gradually shrink with oral antibiotics such as amoxicillin capsules, azithromycin and other sensitive antibiotics. 2. If the lymph nodes are hard, with unclear boundary, small mobility and no obvious tenderness, the possibility of lymphoma is very high, and the diagnosis can be clarified by puncture biopsy under the localization of color ultrasound. After diagnosis, according to the primary tumor, surgery, radiotherapy and other anti-tumor treatments should be carried out according to medical advice. If you find the lymph nodes on your neck are enlarged during physical examination, you should pay attention to it, go to the hospital to do relevant examination in time, and take active treatment after clarifying the cause of the disease.