A mass on the side of the neck should be examined by neck ultrasound because it is common to have enlarged local lymph nodes, which can lead to reactive hyperplasia of local lymph nodes during upper respiratory tract infection or oral and maxillofacial infections and inflammation, and the symptoms can gradually improve after systematic anti-inflammatory and antiviral treatment. In addition, some patients may have tumors, including nasopharyngeal tumors and malignant tumors of the respiratory system or digestive system, which may metastasize to the neck or supraclavicular region, and the patient may have significant abdominal pain, abdominal distension and abnormal bowel changes. The patient should undergo chest CT, gastroscopy and colonoscopy in time, and if necessary, resection and biopsy can be performed to guide the next treatment according to the pathological type, and systemic intravenous chemotherapy or local radiation therapy can be chosen to control the development of the disease.