FARGO -- October is Breast Cancer Awareness Month, and doctors are stressing the importance of annual screenings while sharing the risk associated with high density breast tissue.

There are four categories of tissue density. The higher the density, the more challenging it is to find cancer.

If you have high density breast tissue, physicians recommend doing a 3D mammogram on top of your regular check up.

Physicians say mammograms might miss up to 20% of underlying breast cancers.

"Dense breast tissue can limit the sensitivity of the mammogram, and so, meaning mammographically, dense breast tissue can increase breast cancer risk," Dr. Abby Davis, with the Edith Sanford Breast Center, said.

Davis says about 50% of people have high breast density.