The normal size of submandibular lymph nodes is less than 1cm. The submandibular lymph nodes are immune organs, under normal circumstances, the diameter of submandibular lymph nodes is 0.2-0.5cm, not more than 1cm. if the submandibular lymph nodes are larger than 1cm and painful when touching them, this is an abnormal phenomenon, usually, submandibular lymph node abnormalities are seen in bacterial infections or viral infections. For bacterial infections causing submandibular lymph nodes to be too large, usually need to be under the guidance of the doctor, through the use of busulfan anti-inflammatory tablets and other drugs for treatment; for viral infections causing submandibular lymph nodes to be too large, usually need to be under the guidance of the doctor, through the use of busulfan tablets and other drugs for treatment. If the above symptoms should be timely medical care, need to clarify the cause of the disease, and then can be directed to the cause of the corresponding treatment.