Lymph node pain in the neck is often caused by the following factors: first, infection, which may be caused by infection of some glands in the neck, such as parotid gland infection or submandibular gland infection, which can cause swollen lymph nodes and pain. The EBV infection can also cause swelling of the lymph nodes. Second, it may be caused by dental infections, such as inflammation of the wisdom teeth, which require treatment at a hospital’s stomatology or maxillofacial surgery department. Third, it may be caused by allergic factors, such as contact with paint or cosmetics, etc. Fourthly, it may be caused by lymph node metastasis of malignant tumors, such as thyroid cancer metastasis, etc. It needs to be clarified by thyroid ultrasound and thyroid function. Fifth, a small number of patients are caused by blood system diseases, such as lymphoma.