The symptoms of hard lumps in the breasts are not normal and are caused by milk stagnation, breast hyperplasia, breast fibroids and breast cancer. 1. The typical symptoms are hard lump in the breast, pain, nipple overflow and other symptoms, and are affected by the physiological period, the symptoms will be more obvious before the onset of the physiological period, and the symptoms will be relieved after the onset of the physiological period. 3, breast fibroids also have the symptoms of hard lump in the breast. 4, breast cancer has no obvious symptoms in the early stage, but in the late stage, the hard lump in the breast is obvious and the pain is increased. As mentioned above, hard lumps inside the breast is an abnormal phenomenon, most of them appear because of breast diseases, so it is better to go to the hospital for examination and treatment in time.