<qa>  What is GVHD usually given to treat?GVHD occurs when the donors immune system recognizes a patients body as foreign and reacts against it. GVHD may result in skin rashes and blistering, liver inflammation and gastrointestinal problems including nausea, vomiting, diarrhea and bleeding. Mild GVHD may be treated with topical medications applied to the skin. More severe GVHD requires medications given intravenously by vein or taken by mouth. Steroids are usually given first to treat GVHD but only 40 of people respond to this alone. 