Lymph in the neck is generally divided into four groups, submaxillary chin, mandible, anterior cervical, lateral cervical, sometimes including submaxillary, posterior ear, posterior occipital and other lymph nodes. These lymph locally belong to the region of infection and other lesions cause lymph enlargement and pain, etc. Systemic diseases can also cause corresponding lesions. Normal lymph nodes are flat or round, soft, movable, without adhesions to surrounding tissues, with clear borders and no clusters, sometimes up to 1.5 cm in length and 1.2 cm in transverse diameter, and the number of lymph nodes in the neck is greater than 70, usually only about 20 can be palpated. The lymph nodes mature and improve with age; they are mostly palpable at the age of 1 year, obvious before the age of 7 years or even visible with a tilted head, and usually not palpable after puberty with partial degeneration. Enlarged lymph nodes with pain are mostly inflammatory and benign lesions. Enlarged lymph nodes with no pain are considered as malignant possibility. If the lymph nodes are spherically enlarged, or in clusters, adhering to the tissue around the skin, growing too fast, without fever or pain, they should be removed for biopsy. Therefore, enlargement of lymph nodes is common before 7 years old, mostly in response to viral infection of adjacent tissues or adjacent trauma, and a few causes are caused by hematometabolic system diseases, which usually means observation, review of blood routine, ultrasound, etc. There are no abnormal white blood cells in blood routine, ultrasound to confirm that it is lymphatic tissue, lymph node diameter itself is more than 1.5cm, lymph node longitudinal diameter to transverse diameter ratio <2, hard texture, inactivity, mass, or multiple Hyperplasia is a bad sign. In this case, a biopsy is needed.