Painful breast lumps and cancer are not related. Pain may be inflammation, benign lumps or malignant lumps. Malignant tumors may or may not have pain, so pain and breast malignancy are two concepts. Malignant tumors often do not feel pain and do not have pain when they are relatively small, but when the tumor increases to a certain volume or grows particularly fast or rapidly, often patients will feel significant pain, so it is important to pay more attention when the swelling does not hurt. When the swelling is painful, if it is a malignant tumor, it should grow larger and more obvious, and there will be a very clear palpation, that is, the swelling is felt.