There are many reasons for axillary lymph nodes, which may be normal physiological phenomenon, but also can be seen in inflammation, tumors and other diseases, and their severity depends on the cause of axillary lymph nodes, so it is necessary to pay attention to clarify the specific causes. 1. Physiological phenomenon: there are lymph nodes in the armpit itself, if a small number of lymph nodes are found in the armpit and are not enlarged, there is no need to be overly nervous, it may be a normal physiological phenomenon. 2. Inflammatory factors: bacterial infection, viral infection, etc. can often cause painful enlargement of axillary lymph nodes, which can be touched at the epidermis, and the enlarged lymph nodes can be relieved with anti-infective treatments, so it is relatively not serious. 3. Tumor: for malignant tumors, painless lymph node enlargement can be seen around the tumor, among which axillary lymph node enlargement is more common in breast cancer. At the same time, hematologic tumors, such as lymphoma, can cause painless enlarged lymph nodes, therefore, if there is axillary lymph node enlargement, you need to rule out the occurrence of malignant tumors, which is more serious and you should consult a doctor in time. It is important to note that if there is an enlarged axillary lymph node, you should consult a doctor in a timely manner to clarify the cause of the enlargement, and to be treated accordingly, so as not to delay the condition.