An axillary lymph node of 13mmx8mm indicates that the patient has an enlarged axillary lymph node, which does not indicate the severity, but needs to be combined with the cause of the disease as well as the nature of the lymph node to make a comprehensive judgment. The diameter of the lymph nodes in the armpit is about 5 to 10mm, if the size of the lymph nodes in the armpit is 13mmx8mm, then there is a problem of enlarged lymph nodes. There are many causes of enlarged lymph nodes and their severity varies, so it is important to go to the hospital in time for examination to clarify the nature of the lymph nodes as well as the cause of their development. Generally speaking, if the boundaries of the lymph nodes are clear, there is a certain degree of tenderness and pressure, and accompanied by symptoms such as redness of the skin, then it may be caused by inflammation and infection, which is not particularly serious, as long as the inflammation is actively controlled, then the lymph nodes can gradually subside. However, if the boundaries of the lymph nodes are blurred, the mobility is poor, and the texture is hard, then it means that there may be lymphatic metastasis of malignant tumors, and the condition will be more serious at this time, and it is necessary to carry out further examination in time, and according to the different pathological results for treatment. Therefore, if the size of the axillary lymph nodes exceeds the normal range, you should go to the hospital in time to improve the examination and diagnosis to be treated accordingly.