Question

Our stomach contains hydrochloric acid but we don't experience any burning sensation why

Answer 1

the HCl only burns the food material as our stomach is covered by inner lining called mucus

Answer 2

One, the hydrochloric acid in your stomach isn't as strong as the industrial stuff. The industrial HCl can burn through steel and clean rust off metals almost instantly. Your stomach only needs it to make some food squishier over a span of four hours. 

Second, when you throw up from food, that food dilutes the acidity, so it doesn't taste as acidic coming out. 

But finally, if you throw up on an empty stomach on a fresh day (when you have a nice strong concentration of HCl in your stomach), you will notice how sour and bitter it really tastes. That's your stomach's HCl at full strength. 

And as an additional note, it WILL burn through things, that's why people always recommend you brush your teeth after throwing up. Your teeth will feel funny the morning after if you don't brush them, and habitual people who throw up (bulimic people) have terrible teeth because of the acid's effect of burning through the enamel. 

Brushing helps because there are a lot of basic compounds that neutralize the acid (such as baking soda in most whitening toothpastes).


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