The causes of breast swelling and pain after delivery may be the following: 2-3 days after delivery, the body’s prolactin increases, the milk ducts are not very smooth, which will lead to the milk can not be well discharged, there will be a feeling of swollen milk, that is, the breast will be more swollen. If the milk ducts are not open, the milk will stay in the breast and the blockage for a long time will lead to swelling of the breast, and any longer time may lead to mastitis due to bacterial infection. If a woman suffers from breast enlargement, in this case it is not the milk that causes the swelling, but the milk that squeezes the enlarged breast mass, which in turn can squeeze the milk ducts, resulting in the milk not being discharged very smoothly, leading to swollen breasts. How to relieve postpartum breast distention: First, you can apply hot compresses. Use a warm towel and place it on each side of the breast to apply a hot compress. After the hot compress, you can use a breast pump to suck up the milk, which can effectively relieve breast distention. At the same time, using a suitable breast pump, you can discharge the milk that cannot be drained from the breast ducts, which can reduce breast distension and pain. Postpartum mothers should choose a bra without a steel ring and made of cotton, which is good for the skin, breast distension, and breast duct drainage. At the same time, you can choose a relatively simple local massage to stimulate the breast ducts to discharge milk and reduce postpartum breast distension and pain.