Causes of painless lymph on the left side of the chin include normal absence of lesions, lymph node hyperplasia, lymph node metastasis from lymphoma or other malignant tumors. 1. Absence of lesions: the lymph nodes themselves should not have tenderness, and painlessness is a normal condition. 2. Lymph node hyperplasia: lymph node hyperplasia can also be painless, but need to consult a doctor to clarify the cause of the hyperplasia, generally can rule out acute infections caused by lymphadenitis, while chronic lymphadenitis, lymphatic tuberculosis and so on can have mild pain. 3. Lymphoma or malignant tumor lymph node metastasis: lymphoma or malignant tumor with lymph node metastasis to the left chin can cause painless enlargement of the left chin lymph nodes, which is usually hard and fused and fixed. Common tumors that easily metastasize to left chin lymph nodes include left thyroid cancer, oral cancer, nasopharyngeal cancer, etc. Wasting and anemia may also occur. The absence of pain does not mean that there is no lesion, still need to be hospitalized.