Lymph nodes are small oval or bean-shaped bodies of lymphatic tissue that are distributed throughout the body, varying in size and often in clusters. Lymph nodes are important immune organs in the body and can be divided into superficial lymph nodes and deep lymph nodes according to their location. Usually, lymph node enlargement is mild, single or scattered, soft, no pressure pain, no adhesions, no other symptoms, common in upper respiratory tract infection, no special treatment is needed. In severe cases, the lymph nodes are larger and more numerous, arranged in a finished form, or even adhering to the surrounding tissues, with multiple swollen lymph nodes, accompanied by other symptoms such as fever, local swelling and pain, anemia, and emaciation. In addition, the symptoms of swollen lymph nodes caused by different diseases are different. If the swollen lymph nodes are caused by bacterial infection, the swollen lymph nodes usually have a soft texture and good mobility, accompanied by pain and fever, and the surface skin may appear red, swollen and painful to pressure, which will return to normal when the inflammation subsides. If the enlarged lymph nodes are caused by chronic lymphadenitis, they mainly appear as enlarged restricted lymph nodes with pressure pain, and their diameter does not exceed 2 to 3 cm. If the enlarged lymph nodes are caused by tuberculous lymphadenitis, the lymph nodes are more numerous, adhere to each other, are poorly mobile, and in severe cases, they will break down, and are accompanied by fever, excessive sweating, and weakness. If there is only simple enlargement of lymph nodes and there is no obvious enlargement nor obvious symptoms such as fever, weakness and emaciation, observation can be continued. Once there are obvious abnormal changes, such as progressive enlargement and rupture of lymph nodes, you should immediately go to the hospital for medical treatment. In conclusion, when abnormal enlargement of lymph nodes occurs, you should seek medical attention without delay to avoid delaying the disease.