Im not sure, I've been told that it might be overfeeding issueSwollen air sac, tumor, infected crop?
Is there a vet you can see?
Unfortunately he died today, he has been like that since 3 daysCould be a crop infection as Mizzely said, or aerophagia.
How long has this bird been in this state?
Yes I hand feed my birds. Unfortunately he deid today. About 4 weeks oldAre you hand feeding this bird? ( If so, what are you feeding ) How old is your cockatiel?
Unfortunately he deid today@hmansour how is your bird doing?