Dense breast refers to the different densities of breast tissue that can be categorized as dense or fatty during a mammogram. Fatty breast refers to the structure of the breast, fat tissue accounted for a large proportion, dense breast refers to the proportion of fat tissue accounted for a small amount of the amount of other tissue structure accounted for a larger proportion, dense breast is due to breast hyperplasia and inflammation of the breast caused by breast hyperplasia will be present in the breast lump, the results of its image will be a large extent of the mass occupied. Inflammation of the breast can also be seen on imaging and can be caused by breast fibroids and breast cancer. When dense breasts are detected, it is best to undergo further testing and decide on a course of treatment based on the results of the test.