Sickle Cell Disease is in a group of inherited red blood cell disorders. Normal red blood cells are round like doughnuts, and they move through small blood tubes in the body to deliver oxygen. Sickle red blood cells become hard, sticky and are shaped like sickles used to cut wheat. When these hard and pointed red cells go through these small blood tubes, they clog the flow and break apart. This can cause pain, damage and a low blood count, or anemia.