Because of the distribution of lymph nodes in the head and neck area, physical examination must be performed in order, firstly, facial examination and palpation can be performed at the same time, and the order of examination is preauricular, postauricular, occipital, submandibular, subchin, anterior cervical, posterior cervical, supraclavicular and subclavicular. During the examination, pay attention to the color of the skin at the palpation site, whether there is any skin breakage or rupture, and whether the lymph nodes can be palpated during palpation. During the examination, if the size and shape of the lymph nodes can be felt in relation to the surrounding tissues and their activities, most normal lymph nodes are small in size and cannot be palpated, with a diameter of 0.2-0.5 cm, soft in texture, smooth to the touch on the surface, and adherent to the surrounding tissues without tenderness. When upper respiratory tract infections such as otitis media, tonsillitis, gingivitis and other diseases can cause enlargement and pain in the adjacent lymph nodes of the head and neck, which can be restored to normal after anti-infection and symptomatic treatment. In addition, leukemia, lymphoma and malignant tumor lymphatic metastasis can also cause swollen lymph nodes in the head and neck, mostly painless lymph node enlargement and adhesion to surrounding tissues.