As I said, they can get urate stones (aka "cloacaliths"), which can cause a prolapse & even a need for surgery. So keep him eating & drinking & good humidity; if he's taking f/t, thaw in water & feed it damp if he'll take it that way. (he might not though, he's a BP, lol). And a soak can help too.
Snakes that form cloacaliths can also form more than one, btw. Some little ones may come out OK, but a larger one may get stuck, thus causing an issue with the vent (cloaca).
Like any sort of "constipation", it seems more likely to occur with snakes that are less active (like BPs), & also those whose living conditions tend to dehydrate them (the high temps. that BPs need). Their bodies evolved to deal with their living conditions, but as pets, they are less active...just keep that in mind.