Human lymph nodes are mainly distributed in the following locations: behind the occiput, behind the ear, neck, jaw, supraclavicular, infraclavicular, armpit, both upper limbs, both lower limbs, abdominal cavity, thoracic cavity and so on. There are lymph nodes in many parts of the human body, and when checking for enlarged lymph nodes, the above mentioned areas are mainly examined, either by palpation or by imaging, such as ultrasound and CT, to find out the diseases related to the lymph nodes, and then appropriate treatment can be carried out. Lymph nodes will be enlarged if diseases such as lymphadenitis, lymph node metastasis, lymph node tuberculosis, lymphoma, etc. occur. The treatment of enlarged lymph nodes caused by different etiologies is different, so it is necessary to clarify the cause, and then treat for the cause of the disease.