Enlarged lymph nodes in the armpit are mostly seen in benign lesions that are better treated, and if they are caused by malignant diseases that are not cured. Underarm lymph node enlargement is more common is lymph node inflammation, may be due to shoulder, chest wall, upper limb inflammation or mastitis, etc., often not serious timely anti-inflammatory treatment, such as the use of azithromycin, roxithromycin and other antibiotic drugs, lymph nodes will gradually recover. It may also be caused by tuberculosis, due to the infection of tuberculosis bacillus leading to lymph node enlargement, need to cooperate with the doctor oral isoniazid, rifampicin and other anti-tuberculosis drugs. However, some patients with enlarged lymph nodes in the armpit are caused by cancer metastasis, such as breast cancer metastasis, the lymph nodes tend to be hard, the pressure pain is not obvious, the condition is more serious and not good for treatment, and they need to take surgical treatment, radiotherapy, chemotherapy, etc. as soon as possible. Swollen lymph nodes under the armpit need to go to the hospital in time, with the help of doctors to clarify the cause, and targeted treatment or therapy.