Lymph nodes are found in all parts of the body and belong to the important immune organs of the human body, which are usually divided into superficial lymph nodes and deep lymph nodes. Under normal circumstances, lymph nodes are small, mostly between 0.2-0.5 cm in diameter, with soft texture, smooth surface, no adhesions with surrounding tissues, not easily palpable and no pressure pain. In contrast, for patients with enlarged lymph nodes, there may be local redness, swelling, heat and pain, and nodules the size of broad beans or soybeans may be palpated by hand. The number of swollen lymph nodes, whether they are painful, their texture and adhesion to surrounding tissues are different.1. Number: If only a single area of swollen lymph nodes exists, it is called limited lymph node enlargement and is commonly seen in non-specific lymphadenitis, simple lymphadenitis, lymph node tuberculosis, malignant tumor lymph node metastasis, etc. The primary lesion can be searched for according to the area of lymphatic drainage. If there are more than two areas of lymph node enlargement, systemic lymph node enlargement is considered, which is commonly seen in infectious mononucleosis, AIDS, leukemia, lymphoma, connective tissue disease, etc.; 2. Whether it is painful: lymph node enlargement with pain is mostly seen in acute inflammation, painless lymph node enlargement is mostly seen in malignant tumor lymph node metastasis, lymphoma, etc., while pressure pain may occur for tumors that are growing too fast. 3. Texture: For patients with acute inflammation, the texture of swollen lymph nodes will be relatively soft, while for patients with malignant tumor lymph node metastasis, the texture of swollen lymph nodes will be hard; 4. Adhesion to surrounding tissues: For patients with tuberculous lymphadenitis or advanced lymphoma or cancer infiltration, they often show adhesion of lymph nodes to each other or to basal tissues; 5. Other: For patients with lymph node tuberculosis, actinomycosis or venereal disease Inguinal lymphogranuloma, etc., can cause lymph nodes to break down and form fistulas, which can leave scarring after healing.