Question

We know that the pressure inside our body cancels the atmospheric pressure.But if the pressure exerted by our body increases and what will happen.

Answer 1

you are not affected by it, or you dont realize it, as your blood pressure cancels out the atmospheric pressure. However deep underwater the pressure increases and that is when you feel it pressing down on you, making it harder to breath

I think part of the reason is that the pressure is balanced. That is, the inside of our body is pressurized as well as the environment outside our body. When the balance is disrupted, you can feel the pressure. For instance if you have a mild cold and your eustacion tubes to your ears are swelled shut, and you are a passenger in an airliner that is descending, you feel the increasing atmospheric pressure during the descent ( sometimes painfully so) because the inner part of the eustacion tube can’t equalize the pressure.