30‐day mortality was associated with increasing age, inpatient bleeding episodes, melena, syncope, anti‐coagulant use, increasing number of medications, underlying liver/gastrointestinal disease, underlying cardiovascular disease, underlying respiratory disease, advanced rheumatological disease, advanced renal disease, underlying malignancy, tachycardia, hypotension, lower Hb and raised urea levels. This evidence concerns the gene GSTM1 and gastrointestinal disease.