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Do a search on here for impacted crop.
The crop is where a chicken stores the food it is eating, if all systems are working what is in the crop is passed to and slowly ground up in their gizzard and finally exits via their vent.
Sometimes they don't have any grit in their gizzard and the works gets gummed up. After a bit of time the crop becomes packed full of food.
This can also happen if they get something that can't pass into their gizzard.
It can get to the point where the only way to fix the issue is via surgery.
But first you have to be certain that this is what your chicken actually has.
There are many thread on here about the subject.
It is normal for a chicken's crop to enlarge during the day and to be almost empty when they come down from their nightly roosting.
So the first suggestion is to check their crop first thing in the morning. If it is almost empty then they are fine.
Make certain that if you are feeding your birds other than commercial chicken feed that you also provide free choice access to chicken grit.
BTW, commercial chicken feed does not include scratch as that contains some whole seed.