Axillary lymphoid tissue refers to the axillary lymph nodes, which are the peripheral immune organs of the human body. When infection, tumor, or tuberculosis occurs, the lymphoid tissues may appear enlarged. Lymphatic tissue can be distributed in the armpit, which is an important immune organ of the human body and can play a role in removing harmful and toxic substances from the body. Lymph nodes are normally about 0.5cm in size, soft in texture and usually difficult to reach. When the lymphatic tissue in the axilla is attacked by inflammation and tumor, the enlarged lymph nodes can be touched locally. When the axillary lymphatic tissue is enlarged, it is necessary to observe the texture, mobility and boundaries of the lymph nodes, and consult a doctor in time to clarify the cause of the disease, and be alert to the occurrence of lymphadenitis, lymphoma, lymph node tuberculosis, and lymphatic metastasis of malignant tumors. Axillary lymphatic tissue is an important immune organ of the human body, a variety of pathologies can lead to its proliferation and enlargement, when there are abnormal manifestations should be timely medical consultation and treatment, which will help to cure the disease as soon as possible.