If the breast swelling and pain is serious during weaning, it may be the pain caused by the accumulation of milk. If not treated in time, it may easily cause mastitis and other conditions, and also cause local hard lumps, etc. You can use a breast pump to suck out part of the milk, which can relieve the pain and prevent local lumps, but you cannot completely suck out the milk. If you use a breast pump frequently, it will easily stimulate your breasts and lead to an increase in milk secretion, which will affect weaning. During the weaning period, you need to apply hot compresses with towels, and it is recommended to massage more locally to relieve the local pain and help the local lumps to be absorbed. During weaning, you need to stop breastfeeding and drink less soup, especially fish soup, chicken soup and other soups with high protein content, which can reduce milk secretion. You can also drink water with fried malt and eat fennel, which have the effect of returning milk, or you can take vitamin B6 for returning milk under the guidance of a doctor.