Despite recent advancements in allogeneic hematopoietic stem cell transplantation, graft-versus-host disease (GVHD) still has been the major cause of morbidity and mortality following transplantation. This review paper focuses on the pathophysiology mechanisms, risk factors, clinical presentations, stage and grading, prophylaxis, and treatment of acute GVHD. The standard treatment of acute GVHD involves the intensification of immunosuppressive therapy with adequate topical supportive management. A review of the adverse events follow transplantation unmasks the need of evidence-based medical and nursing practice to improve the quality of the holist care for these patients who received allogeneic hematopoietic stem cell transplantation.