Common causes of enlarged right mandibular lymph nodes include lymphoma, tumor metastasis, inflammation, etc. It is necessary to clarify the cause of the disease and then actively treat the cause. 1. Lymphoma: malignant tumors originated from lymphatic tissues and lymph nodes may invade the right mandibular lymph nodes, resulting in painless enlargement of these lymph nodes. 2. Tumor metastasis: some malignant tumors such as lung cancer, nasopharyngeal cancer, laryngeal cancer and other cancer cells metastasize through lymph, which will cause enlargement of right mandibular lymph nodes. 3. Inflammation: Inflammation such as tonsillitis, pharyngitis, gingivitis, pulpitis, etc. will stimulate the lymph nodes in the right jaw, causing enlargement and pain, which is often accompanied by lymph node tenderness. Due to the individual differences and the diversity of causes, it is recommended to go to the hospital in time to identify the causes of the enlarged lymph nodes in the right jaw and actively cooperate with the doctor to receive standardized treatment.