Intestinal graft-versus-host disease.

Graft-versus-host disease (GVHD) is a significant complication of allogeneic hematopoietic cell transplantation, an immune response against the host's tissues, resulting in inflammation and intestinal damage. GVHD is one of the leading causes of morbidity and mortality in this group of people, with an incidence of approximately 29.9% to 36% in acute grade II-IV gastrointestinal cases.