The reason why breast staggered tumor can cause pain symptoms may be due to compression, rapid growth of tumor and other reasons. 1. Compression: the development of breast anaplastic tumor will lead to the increasing volume of tumor, and when the tumor is larger in size, it may lead to the compression of local tissues, thus causing pain and discomfort. 2. The tumor grows too fast: although the growth rate of breast anaplastic tumor is relatively slow in most cases, the tumor can grow rapidly, only that it will stop growing or grow slowly after a certain degree, and the rapid growth process may cause the surrounding tissues to be pulled, causing pain and discomfort. Also, if there is inflammation in the breast, pain may occur. In fact, breast stromal tumors do not usually cause pain, but only a few patients may experience localized pain in the breast. Mastoid tumors are benign and can be treated by surgical removal of the tumor. If you notice any unusual lumps in your breasts, it is important to consult a medical professional.