Enlarged lymph nodes in the right armpit may be caused by tumor or inflammation, which should be examined and diagnosed clearly and then treated according to doctor’s prescription. 1. Tumor: It may be caused by malignant tumors such as right breast cancer, lung cancer, nasopharyngeal cancer, thyroid cancer and so on, which metastasize to here through lymph, thus resulting in swollen lymph nodes in the right armpit. Lymphoma, lymphoblastic leukemia and other diseases can also lead to swollen lymph nodes in the right armpit. Lymph node enlargement caused by tumor factor, the lymph node texture is hard, no tenderness, poor mobility. Pathological examination should be performed on the enlarged lymph nodes by puncture, and surgery, radiotherapy, chemotherapy, targeted therapy, bone marrow transplantation and other anti-tumor treatments should be performed as prescribed by the doctor after a clear diagnosis. 2. Inflammation: It may be due to the inflammation of the right upper limb, right shoulder, breast and other tissues or organs, the pathogens or toxins spread to the right axillary lymph nodes along with the lymphatic vessels, resulting in the enlargement of the right axillary lymph nodes, which are soft in texture and good in mobility, and may present with the symptoms of tenderness, fever, etc. For bacterial infection, Amoxicillin can be used. For bacterial infections, antibiotics such as amoxicillin and cefaclor can be taken; for viral infections, drugs such as acyclovir and ribavirin can be taken; for lymphatic tuberculosis, anti-tuberculosis drugs such as isoniazid and rifampicin can be taken. Therefore, patients with enlarged lymph nodes in the right armpit should consult a doctor in time to get a clear diagnosis and follow the doctor’s instructions.