Sickle cell anemia is a genetic blood disorder where red blood cells become rigid and sticky and form into a sickle shape. These sickle cells can get stuck in blood vessels and slow or block blood flow, causing pain. Symptoms include anemia, swelling of hands and feet, frequent infections, and delayed growth. It is caused by a mutation in the gene that controls hemoglobin, which carries oxygen in red blood cells. While there is no cure, treatments can help manage pain and prevent complications such as stroke, acute chest syndrome, and organ damage.