If a lump is found in the breast during breastfeeding and there is significant pain, it is more likely to be caused by inflammation, mainly secondary to milk stagnation, especially in primiparous women. The inflammation may leave localized nodules and hard lumps, and the patient may have painful symptoms, and the examination will reveal relatively well-defined lumps with hard borders in the breast. At the same time, it can be combined with physical therapy methods such as hot compresses and massage, which can also allow the inflammatory mass to gradually subside, and if necessary, surgery can also be chosen to remove the lesion, as well as intravenous anti-infection treatment. For patients who are breastfeeding, it is important to keep the milk emptying smoothly to avoid secondary infections from stagnation.