Lymph nodes are lymphatic structures that can be scattered throughout the body, usually oval or round, with a diameter of 0.5 cm or less, and are immune organs of the body. They can be found in the neck, armpits, lungs, clavicle, groin and intestinal system, and are interconnected with lymph nodes and lymphatic vessels, and are also important for the body’s immune response. If there is enlargement of lymph nodes, painful pressure, mucus or hardness changes, it is necessary to be alert to inflammation of lymph nodes, and if abnormal changes occur, it is very likely that there is a chance of metastasis of malignant tumors. If there is a generalized lymph enlargement, it is very likely to be a possibility of lymphoma, and it is best to go to the hospital for diagnosis and treatment.