Enlarged lymph nodes in parotid gland are usually related to bad habits, inflammatory lesions and tumors in the tissues around parotid gland. 1. Bad life habits: if patients often smoke, drink alcohol and eat spicy and stimulating food, it may induce chronic inflammation in the throat, which may stimulate lymph node enlargement in the parotid gland. 2. Inflammatory lesions of tissues around parotid gland: for example, dental lesions, periodontitis or apical abscess caused by dental caries can also cause parotid lymph node enlargement. 3. Tumor: with malignant tumor of parotid gland, oral cancer and other diseases, lymph node metastasis usually occurs, resulting in parotid lymph node enlargement. When the parotid lymph nodes are enlarged, patients should go to the hospital in time to improve the examination, clarify the cause of the disease under the guidance of doctors and carry out targeted treatment.