KFF Health News Jan 21 2026 Serenity Cole enjoyed Christmas last month relaxing with her family near her St. Louis home, making crafts and visiting friends. It was a contrast to how Cole, 18, spent part of the 2024 holiday season. She was in the hospital — a frequent occurrence with sickle cell disease, a genetic condition that damages oxygen-carrying red blood cells and for years caused debilitating pain in her arms and legs. Flare-ups often would force her to cancel plans or miss school. "