What is breast density?
Breasts are made up of a mixture of different tissues. Your breasts are considered dense if you have a lot of fibrous or glandular tissue, but not much fat. Density may decrease with age, but there is little, if any, change in most women. Density is determined by the radiologist who reads your mammogram, and the density is classified according to a standard 4-level scale. Your doctor should be able to tell you whether you have dense breasts based on where you fall on the density scale.