The causes of lymphatic blockage mainly include inflammatory reaction, tumor factors, surgical factors, etc., as follows: First, inflammatory reaction: due to inflammatory reaction, if there is a local inflammatory reaction, the first organ to react is lymph, and the inflammation reaches all parts of the body through the lymphatic system and will be immunized in the lymphatic system. In this case, if the inflammation is more serious, it will cause the blockage of lymph and the local lymph nodes may become enlarged. Secondly, tumor factor: due to the influence caused by tumor factor, tumor has the characteristics of spreading along the lymphatic direction or distant metastasis. If the tumor cells pass through the lymphatic vessels and cause lymphatic metastasis, lymphatic blockage will occur, and the clinical manifestation will be obvious enlargement of lymph nodes with hard texture. Thirdly, surgical factor: due to the influence of surgery, such as axillary lymph node dissection, it will cause certain damage to local lymph, and after the damage, the lymph will be blocked, which can be clinically manifested as swelling of the upper limb on the patient’s side of the surgery, and the specific reason may need to be analyzed.