Couple questions and couple suggestions:
I am not saying for sure... But it is a possibilty that your HE is a SHE. I breed female Florida kings at 20" . So it could be that you have a female that is ovulating and could explain the swelling. Since desert kings are a smaller species and "if" you snake is female it would explain the periodic swelling.
But most likely it is the food item that is causing the swelling. Without seeing the snake and the swelling there is no way to really tell. But it sounds to me that:
a) you snake is swelling because it is not digesting properly OR the swelling you see is normal for a snake that has just eaten the day prior.
b) you have something else going on with the snake that could be a health issue.
Is the swelling from the lower half of the snake or only mid section where the food bolus is?
What concerns me more is why your snake is regurging larger food items. That is not normal. First, make sure to keep water bowls clean. You also might look into finding some liquif flagyl. A dropper full every 7-10 days for 3 treatments should clean any flagellates.
[*if you can locate some liquid flagyll you can email me diectly and I will help you with dosage and explain what else you need to do.]
The only other possibilty why your snake is regurging because you are not providing a hotspot on one end of its encloser. the kingsnake should be able to thermoregualte to properly digest its food (which would also explain the excessive swelling when pinkies are in the gut and why larger items are regurged), if not, the food is not getting digested fast enough and is actually rotting inside the stomach..
A proper hotspot should be appox 90F. Get a heat pad or other tank heating source (do not use a heat lamp or lightbulb for a heat source!!).
If the snake is in a room that is below 82F that "could" be the problem with the regurges. Even if your other snakes digest and are doing fine, with those temsps , does not eman all snake will be able to function properly. A one set temperature is really boderline for keeping snakes eating and digesting healthly anyway.
Without more info and /or seeing the snake and setup, it is hard to diagnose the symtoms or issues you have with this snake.
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