According to the American Red Cross, every two seconds someone in the U.S. needs blood.
WATCH: Our Chicago Part 1
That need is met with donations from everyday people, and by large-scale efforts such as the ABC 7 Great Chicago Blood Drive.
LEARN MORE: The ABC7 Great Chicago Blood Drive
Celena Roldan, the regional chief executive officer of the American Red Cross of Illinois, and Dr. Kyle Mack, a pediatric hematologist with Lurie Children's Hospital, joined ABC 7 Chicago's Our Chicago segment Sunday to talk about the need for blood donations.
WATCH: Our Chicago Part 2
Roldan said there is typically a blood donation shortage in the winter months, so it's very important for donors to come out.