Tachycardia and Orthostatic Hypotension. There have been discussions in the literature about other findings to rule in/out upper GI bleeding.
[mdedge.com]
[…] an endoscope) Inflammation of the large intestine due to radiation therapy, infection, or disruption of the blood supply (as occurs in ischemic colitis) Bloody diarrhea, fever
[msdmanuals.com]
A nasogastric lavage with red blood (summary LR, 3.1; 95% CI, 1.2-14.0), tachycardia (LR, 4.9; 95% CI, 3.2-7.6), or a hemoglobin level of less than 8 g/dL (LR range, 4.5-6.2
[ncbi.nlm.nih.gov]