What causes breast lymph node enlargement?

The main causes of breast lymph node enlargement are tumor factors, immune diseases, reactive hyperplasia, etc. 1. Inflammatory reaction When breast tissue or surrounding areas are infected, the immune system will be activated, lymphocytes gather in lymph nodes, resulting in lymph node enlargement. For example, infectious diseases such as mastitis can cause inflammatory reactions and enlargement of local lymph nodes. 2. Tumor factors Malignant tumors in the breast, such as breast cancer, cancer cells may metastasize to lymph nodes, causing lymph node enlargement. Tumor cells can spread through lymph vessels, first invading adjacent lymph nodes, and as the disease progresses, lymph nodes may gradually enlarge and harden. 3. Immune diseases Some autoimmune diseases may lead to systemic or local lymph node enlargement, and breast lymph nodes may also be affected. Such diseases will make the immune system abnormally active, reacting to their own tissues, and then affecting lymph nodes. 4. Reactive hyperplasia Diseases or stimuli in other parts of the body may cause reactive hyperplasia and enlargement of breast lymph nodes. For example, severe infection and trauma in other parts of the body may lead to breast lymph node enlargement through systemic immune response. In addition, drugs and endocrine disorders may also affect the lymph node state to a certain extent, leading to breast lymph node enlargement. When breast lymph node enlargement is found, detailed examination and evaluation are required to clarify the cause and take appropriate treatment measures.