Milk blockage is caused by milk stagnation in the milk ducts, which can lead to breast pain, breast hyperplasia nodules and mastitis. 1. Breast pain: When the milk is stagnant in the milk ducts, resulting in a serious milk blockage that cannot be discharged smoothly, it will cause breast swelling and pain, causing discomfort. 2. Mammary hyperplasia nodule: refers to the proliferation of mammary epithelial and fibrous tissues, excessive milk inside the breast, hard lumps will occur after the blockage of stagnation, symptoms include menstrual disorders, nipple overflow, emotional instability and so on. 3. Mastitis: A serious blockage of milk can lead to stagnation of milk, which in turn can lead to bacterial infection and inflammation, which can be manifested as redness, swelling, heat and pain in the breast area. The first thing you can do is to apply a wet compress for 3-5 minutes, massage and empty the breasts, and if you have a serious problem, you should go to the doctor’s office in a timely manner.