For healthy women, breast lumps during breastfeeding is usually due to the formation of milk stagnation, you can choose hot compresses, cold compresses are not recommended. However, it should be noted that some breastfeeding women breast lumps are breast fibroid, breast hyperplasia, then both cold or hot compresses, the effect is very limited, you should go to the hospital in a timely manner to do the relevant examination, symptomatic treatment. Hot compresses are good for breast milk stagnation because blood vessels dilate when the temperature of the breast rises, and the blood supply to the breast increases accordingly. Hot compresses can also relax the milk ducts and alveoli, which is conducive to the discharge of milk. At the same time, due to the increase in temperature, the milk stagnant in the lump is in a good state of liquefaction, which is beneficial to dredging. If hot compresses do not relieve breast lumps, it is important to note that there may be problems such as breast fibroids. Cold compresses are not beneficial for breast milk stagnation, because when the temperature of the breast decreases, blood vessels contract, blood circulation decreases, and the milk ducts are not conducive to the discharge of milk when they are cold, and when the temperature decreases, the milk in the lumps tends to coagulate, making it even more difficult for them to be discharged. Women who have hard lumps in their breasts during breastfeeding should pay attention to a low-fat, high-fiber diet and eat more whole grains and vegetables, but they need to control the intake of animal protein while using the hot compress treatment method. Pay attention to adjusting the mind, appropriate exercise, enhance physical fitness.