Anterior cervical lymph nodes, i.e. superficial cervical lymph nodes, are located at the posterior border and superficial surface of the sternocleidomastoid muscle and are arranged along the superficial external jugular vein. Their main function is to collect superficial cervical lymphatic fluid, and their output ducts are fed into the deep cervical lymph nodes. Lymph nodes are distributed throughout the body, and the cervical lymph nodes, including preauricular and postauricular lymph nodes, occipital lymph nodes, submandibular lymph nodes, sub-chin lymph nodes, anterior cervical and posterior cervical lymph nodes and supraclavicular lymph nodes, are important immune organs. When inflammation and infection, tumor metastasis and other lesions occur in the head, neck, face and oral cavity, the cervical lymph nodes can show enlargement. Normal superficial lymph nodes in the neck are mostly between 0.2 and 0.5 cm in diameter, with a smooth, soft surface, no adhesion with the surrounding tissues, no pressure and pain, and are difficult to be touched. If the lymph nodes are palpable, it usually suggests that there may be enlarged lymph nodes, and it is recommended that the patient go to a regular medical institution in time for a clear diagnosis and appropriate treatment.