To answer the question of how to deal with swollen lymph nodes in the armpit, it is necessary to first identify the cause. The common causes are lymphadenitis or reactive hyperplasia of lymph nodes caused by infection, and malignant tumors. With the exception of malignant tumors, most patients can be cured after systematic treatment. And those due to malignant tumors can also achieve the purpose of prolonging the survival time and improving the quality of life if they actively cooperate with the treatment: 1. Lymphadenitis: Lymphadenitis is mostly caused by infections such as Streptococcus haemolyticus and Staphylococcus aureus. Often secondary to mastitis, boils, folliculitis infections in other parts of the body, in addition to swollen lymph nodes, can also be accompanied by redness, swelling, heat and pain at the site of the lesion. Usually antibacterial drugs, such as penicillin, amoxicillin, and levofloxacin, are taken for corresponding treatment. Patients with significant fever can be treated with antipyretic treatment by ibuprofen, acetaminophen, etc. If it causes lymph node abscess, it can also be surgically incised and drained; 2. Lymph node reactive hyperplasia: usually due to systemic diseases or local inflammation, usually no additional treatment is needed for the lymph nodes themselves, which will improve with the improvement of systemic diseases or local inflammation; 3. Malignant tumors: often secondary to breast cancer, stomach cancer, liver cancer and other diseases, cancer cells metastasize to axillary lymph nodes through lymph, thus causing axillary Lymph node enlargement, which may or may not be accompanied by lymph node pain. If the malignancy of the tumor is not high and the tumor is in the early stage, after timely surgery to remove the tumor, and at the same time supplemented by radiation therapy, chemotherapy, immunotherapy and other comprehensive treatment means, a better effect can be achieved. In addition to the above common causes, axillary lymph node enlargement can also be caused by lymphatic tuberculosis, chronic lymphocytic leukemia, malignant histiocytosis, filariasis, toxoplasmosis, etc. It is recommended that patients clarify the causes and then carry out targeted treatment.