1.Acute lymphadenitis: the mass has redness, swelling, heat and pain. 2.Chronic lymphadenitis: the lymph nodes are enlarged about 0.5-1.0cm, soft in texture. Most of them have obvious foci of infection and are often limited lymph node enlargement, with pain and pressure pain, generally not more than 2-3cm in diameter, and will shrink after anti-inflammatory treatment. Enlarged inguinal lymph nodes, especially flat lymph nodes that have been present for a long time without change, are mostly of no importance. However, enlarged cervical and supraclavicular lymph nodes with no obvious cause signify systemic lymphoid tissue proliferative diseases. 3. Lymph node tuberculosis: more low-grade fever, swollen lymph nodes with hard texture (fibrosis or calcification), non-smooth surface, non-uniform texture (cheese-like changes), or cystic due to cheese-like necrosis, or adhering to the skin, poor mobility, and may break down. They are often associated with pulmonary tuberculosis. These patients have positive tuberculin tests and blood antibodies to tuberculosis. The diagnosis is made by multiple, multi-site lymph node puncture, smear and biopsy, and to identify the primary lesion of tuberculosis. 4.Nodular disease: Mostly seen in adolescents and middle-aged people, the lymph nodes are mostly within 2cm in diameter, and the texture is usually hard, non-fusing and not adherent to the skin. The lymph nodes are often invasive of bilateral lung hilum, radiating, and more than 90% of them have lung changes clinically, accompanied by long-term low fever. Lymph nodes can be enlarged throughout the body, especially in front of and behind the ear, under the jaw, and next to the trachea. There may be malaise, fever, night sweats, loss of appetite, and weight loss. It is difficult to distinguish clinically from malignant lymphoma. There may be hepatomegaly and/or splenomegaly, and the mediastinum and superficial lymph nodes are often invaded and enlarged. There may be leukopenia, anemia, and increased sedimentation during the active progressive phase. Serum globulin is partially elevated in about 1/2 of the patients, with IgG elevation being more common, and plasma albumin is decreased. Serum calcium is increased, serum uric acid is increased, and serum alkaline phosphatase is increased. Serum angiotensin-converting enzyme (SACE) activity is increased in the acute phase (normal value is 17,6-34u/ml), which is informative for diagnosis. Serum interleukin-2 receptor (IL-2R) and soluble interleukin-2 receptor (sIL -2R) are elevated, which has more important significance for the diagnosis of nodal disease. 5. Necrotizing lymphadenitis: mostly in young adults, with sudden onset of high fever that does not subside or persistent low fever, often accompanied by upper respiratory symptoms, resembling influenza. The enlarged lymph nodes often have pressure pain and do not fuse with each other. Pathological examination shows extensive coagulative necrosis of the lymph nodes surrounded by reactive histiocytic proliferation without neutrophil infiltration. The disease may resolve spontaneously within 1-2 months (self-healing) with good prognosis. 6. Giant lymph node hyperplasia: lymph node enlargement of unknown cause, invading the thoracic cavity, mediastinum and hilar and intrapulmonary lung. After the mass is removed, the symptoms disappear. 7.Metastatic lymph node carcinoma: hard texture, no pressure pain and inactivity. It is mostly seen in the metastasis of nasopharyngeal cancer, lung cancer and gastrointestinal tumor. 8. Reactive lymphadenitis: When the body is subjected to trauma or disease or foreign antigen induced emergency reaction, it will lead to reactive lymphadenitis. For example, some drugs or biological products can cause fever, rash, lymph node enlargement, etc.. Those caused by common chemical drugs are called drug fever, such as methyldopa, isoniazid, phenytoin sodium and various vaccines; those caused by biological products are called serum sickness. All of these can cause swollen lymph nodes.