The lymph nodes in the neck are more abundant and can be palpated when superficial lymph nodes become enlarged. The age at which lymph nodes in the neck of young children usually disappear is mainly related to the specific cause of the swollen lymph nodes and cannot be generalized. Lymph nodes are normal immune organs of the body and never disappear; they only vary in size. The swollen lymph nodes in the neck of young children are mostly caused by inflammation, they are more mobile and may be painful to pressure. Generally, the swollen lymph nodes can gradually become smaller after 5-7 days of antibiotic treatment. However, it is difficult to disappear immediately and can gradually subside as the child grows up, but there is no clear clinical time point for the specific age of subside. If the lymph nodes in the neck of young children are caused by Hodgkin’s lymphoma, leukemia, metastases, tuberculosis, etc., they are hard and poorly mobile, and usually do not disappear, and require pathological examination for a clear diagnosis and symptomatic treatment. Therefore, once swollen lymph nodes are detected in the neck, children should go to the pediatric department of a regular hospital for routine blood tests and ultrasound of the neck to clarify the diagnosis. After diagnosis, children should avoid spicy and irritating foods in their daily life.