De Latour flags these symptoms as ones to watch: bloating, abdominal pain, acid reflux, unintentional weight loss, heartburn, diarrhoea, blood in your stool or vomit, vomiting, loss of appetite, chest pain, new anaemia (especially iron deficiency), and early satiety – that’s feeling full faster than usual.
Article source: https://www.huffingtonpost.co.uk/entry/excessive-burping-health-signs_uk_6a0edb0ae4b084c012e35aee