Once I was on a flight and felt bloated inside and then got up to go to the rest room. Once I got up the bloatedness went away before I reached the rest room. So I returned to my seat (it was an aisle seat that time) and a few minutes later the bloateness returned.

So I can imagine why someone might have the urge to get up often.

In this specific instance there was a way to reduce disrupting a person at the aisle -- pass wind while seated and ask to get up only for more pressing matters.