According to the World Health Organization, breast cancer became the most common cancer this year, accounting for 12% of all new cancer cases worldwide. In addition, breast cancer is the most frequently diagnosed cancer among American women. However, some men are also at risk for breast cancer.

The main factors that influence your risk of breast cancer include being a woman and getting older. Additional risk factors that are out of your control include genetic mutations, exposure to radiation therapy, your reproductive history and your family history.

October is Breast Cancer Awareness Month. As such, this is the perfect time to refamiliarize yourself with the following warning signs of breast cancer:

Screenings can’t prevent cancer, but early detection can make treatment more effective. Women ages 45 to 54 should get a mammogram each year, while women age 55 and older can switch to biennial screening. For more information about breast cancer risk factors, talk to your doctor or visit breastcancer.org.