Hard lumps in the breast lying down can be benign lesions or malignant tumors. Benign tumor lesions are mostly breast fibromas, breast lipomas, and thoracic cysts, etc. In this case, if you touch with your hand in the diseased area, you can feel that the hard lumps are relatively smooth, and the shape can be clearly identified, and there is no pain when you normally touch and press. In malignant breast lumps, such as breast cancer, it is not easy to distinguish the shape of the lump when touched by hand, the areola and nipple are dark in color, and sometimes there is liquid spillage from the nipple or blood in the nipple. Benign breast lumps are usually examined by chest ultrasound, which can check the size and density of the hard lump. Malignant breast lumps need to be detected by molybdenum target test or breast MRI to determine the location, size and number of the source of the disease, and based on the data from the test, an expert consultation will be conducted as soon as possible to make an effective treatment plan.