Milk passes but there are hard lumps in the breasts are considered to be the following possibilities: First, it is considered to be the stagnant milk is not exhausted, too much milk stagnation, more hard lumps, although the milk passes, but as long as there are 1-2 mammary ducts do not flow smoothly there will be hard lumps in the breasts, and you need to exhaust all the milk to be able to do so. Secondly, if you are suffering from inflammation of the mammary glands, especially if you are breastfeeding for the first time, not only will you have hard lumps in your breasts, but you will also have redness, swelling and pain. Third, it is considered to have breast hyperplasia, the typical symptoms of this disease are hard lumps in the breasts and breast pain, especially before menstruation, the symptoms are more obvious, and after menstruation, it will gradually recover. Considering the special nature of the medication during breastfeeding, never self-medication, it is recommended to go to the hospital in time to do ultrasound examination, if it is a milk stagnation can be hot compresses, massage and rubbing hard lumps, if it is caused by other diseases, it is recommended that targeted treatment.