Inflammatory disease or condition of the gastrointestinal tract, such as ulcers, severe esophagitis, or Crohns disease.
Severe heart or lung disease that makes you a poor candidate for any surgery.
Esophageal or gastric varices (a dilated vein). It might also be something such as congenital or acquired intestinal telangiectasia (dilation of a small blood vessel) and/or portal hypertension.