A hard lump in your milk may be caused by the presence of a lump in the breast, which may be related to breast fibroadenoma, breast sarcoma, and breast cancer. Breast fibroadenoma is a common breast tumor in young women, with a high prevalence at the age of 20 to 25, and patients often have no self-awareness of symptoms except for the lump. The lump grows slowly, has a smooth surface and is easy to push. It is usually treated by surgical excision. Breast sarcoma is a rare malignant tumor, highly prevalent above 50 years old, with a large breast lump, obvious border, good mobility, and dilated veins sometimes visible on the surface. It is usually treated by localized mass enlargement excision. Breast cancer is one of the common malignant tumors in women, and it is more common at the age of 45 to 50 years old. In the early stage, there is a painless, single small lump in the breast, which is hard, non-smooth, not clearly demarcated from the surrounding tissues, and not easy to be pushed. However, in the later stage, there will be “dimple sign” and “orange peel-like” changes, which will make the nipple flat, retracted and concave. If a lump is found in the breast area, you should consult a doctor for examination and treatment to avoid delaying the condition. Pay attention to the hygiene of the breast area on weekdays to prevent infection.