Marin Ellis, first time question asker asks, why do we forget pain? I've had three babies with no meds, but I have forgotten the amount of pain I was in with each and gladly had the next. Marra Joanna: The thing that we know now is like with pain, it's always a complicated answer. Research shows that the chemicals in marijuana can actually lower pain volume. But there's also a couple of other complicating factors. Overuse of marijuana causes an amissus syndrome where your stomach doesn't want to eat any more food.