Breast nodules and milk blockage during lactation differ in cause, nature and management. Causes: Breast nodules during breastfeeding can be caused by a variety of etiologic factors, such as estrogen and progesterone disorders leading to mammary hyperplasia, milk stagnation and infection leading to acute mastitis. Breast blockage may be caused by insufficient breastfeeding experience, incorrect posture, etc. It may also be caused by breast hyperplasia, acute mastitis and other diseases that lead to malformation and blockage of the milk ducts, resulting in milk not being able to be discharged. 2. Nature: Breast nodules during breastfeeding generally refer to the manifestations of breast diseases that occur during breastfeeding, such as acute mastitis, breast cysts, breast hyperplasia, fibroids, breast cancer and other benign and malignant diseases. Milk blockage may just be a symptom of incorrect breastfeeding, which may develop into acute mastitis, accumulated breast cysts and other diseases if not handled appropriately; it may also be a symptom of breast diseases. 3. Treatment: Breast nodules during breastfeeding should be seen promptly for ultrasound and other imaging tests to assess the nature of the nodule, and puncture biopsy if necessary, to clarify the disease and then treat it. Breast blockage can generally be improved by massage, hot compresses, baby sucking stimulation, etc. If it is difficult to improve after the above methods, you should also consult a doctor. It is recommended that people with breast nodules and milk blockage that is difficult to improve should consult a doctor for further examination to identify the cause of the blockage and then treat it aggressively.