The causes of lymph nodes in the armpit are as follows: 1. It may be caused by inflammation in the soft tissues or organs around the armpit, lymph nodes refer to swollen local lymph nodes, usually caused by infection, such as axillary folliculitis, lymphadenitis, pneumonia, etc. may stimulate the lymph to form nodes, patients should first go to the hospital for examination to confirm the cause and then carry out targeted treatment, when the inflammation is controlled the lymph nodes will The lymph nodes will subside on their own when the inflammation is controlled, and can be treated with oral antibiotics, such as cefaclor, ornidazole dispersible tablets, etc. 2. If a woman has swollen lymph nodes in the armpit, it may be caused by breast disease, and the patient should go to the hospital in time for relevant examinations, such as breast ultrasound, axillary lymph node ultrasound, etc. The most common breast disease that causes lymph nodes in women’s armpits is breast hyperplasia, which usually does not require treatment, as long as it is regularly reviewed. Patients should usually pay attention to local hygiene, maintain a stable mood, avoid anger, balanced nutrition, and enhance physical fitness.