Question

Give reason why do we burning sensation in the stomach when we overeat

Answer 1

Our stomach contains HCl and when we overeat then more HCl is released leading to more reaction and sometime some HCl also reacts to stomach wall...
this causes the effect of heating...

Answer 2

Hydrochloric Acid (Hcl) is produced in a greater amount when we overheat. Which makes our stomach acidic and leads to a burning sensation :-)