Normally, the axilla has lymph nodes that are difficult to reach and are normal physiologically. If the axillary lymph nodes can be palpated and are accompanied by enlargement or painful symptoms, it is necessary to pay attention to them. The normal axillary lymph nodes are about 0.5-1cm in diameter, and their main function is to participate in the body’s immune response, which is usually difficult to touch, but some people with thin physique can feel them, which is normal. In addition, patients can palpate the axillary lymph nodes, which are usually due to enlarged lymph nodes. The etiology is mostly seen in bacterial and viral infections, which are easier to treat. It is common to see axillary lymph node metastasis in malignant tumors of the breast, which is a more serious condition and requires hospitalization. When axillary lymph nodes appear, you should go to the hospital promptly, and if necessary, ultrasound examination of axillary lymph nodes and breast should be performed.