The appearance of 2-3 cm lymph nodes in the patient’s neck is enlarged lymph nodes, most of which are caused by diseases. There are various reasons for the enlarged lymph nodes in the patient’s neck, such as inflammation, tumors, immune diseases, and so on. 1. Inflammation: If the patient has an infection at the lymph of the neck or the neighboring tissues, there is a possibility of lymph node inflammation, which leads to lymph node enlargement. You can use antibiotics such as cephalosporin and penicillin for anti-infection treatment under doctor’s guidance. 2. Tumor: lymph is the way of malignant tumor metastasis, such as gastric malignant tumor, colon malignant tumor can cause intra-abdominal or retroperitoneal lymph node enlargement, after diagnosis, cooperate with the doctor to carry out surgical treatment, chemotherapy, radiotherapy, targeted therapy and other anti-tumor treatment. 3. Immune diseases: such as allergic sepsis, systemic lupus erythematosus, connective tissue disease and other immune lesions, can also cause cervical lymph node enlargement. Can be under the guidance of the doctor some immunosuppressants, glucocorticoids, chemotherapy drugs in order to effectively control. When the symptoms of 2-3 centimeters lymph nodes appear, it is recommended to go to the hospital in time, after a clear diagnosis for targeted treatment.