Graft-versus-host disease (GvHD) is a serious complication that may occur after a patient undergoes a blood or organ transplant.
Twelve-year-old Emmett is big into hockey. He started skating when he was 4 and playing when he was 6. He had hockey hair. He skateboarded. He was outside playing sports every minute he could. Then when he was 10, he started to feel lightheaded and fatigued.