KFF Health News Jul 17 2025 Gary Sergott felt weary all the time. "I'd get tired, short of breath, a sort of malaise," he said. He was cold even on warm days and looked pale with dark circles under his eyes. His malady was not mysterious. As a retired nurse anesthetist, Sergott knew he had anemia, a deficiency of red blood cells. In his case, it was the consequence of a hereditary condition that caused almost daily nosebleeds and depleted his hemoglobin, the protein in red blood cells that