Liver cysts do not cause left neck lymph node enlargement; the cysts themselves are benign lesions that do not develop metastases and are usually not accompanied by an inflammatory response, nor do they cause reactive lymph node enlargement. The causes of lymph node enlargement mainly include inflammation, immune system diseases and tumors. 1. Inflammation: when there is infection in the body, the lymphatic system in the body will kill the pathogen, which will cause reactive enlargement of lymph nodes. 2. Immune system diseases: autoimmune system diseases can also lead to lymph node enlargement, which is mainly caused by the increased activity of the immune system. 3. Tumor: malignant tumors with lymph node metastasis, along with the growth of tumor cells can also cause lymph node enlargement. Liver cyst itself and lymph node enlargement are not closely related, the lymph node enlargement has not been improved, accompanied by local pain, you need to consult a doctor in time for observation, after diagnosis of the condition under the guidance of the clinician to carry out standardized treatment, to avoid misunderstanding the condition.