Egg binding causes a chicken to behave in an unusual manner. They will usually be seen standing very still, almost frozen in place. They will be very quiet, no talking at all. Sometimes, they will sit in a nest for hours without producing anything. Severe egg binding causes a full crop and also a very messy, watery and smelly discharge from the vent. There is no doubt or guessing involved in egg binding.
Egg yolk peritonitis is another serious but chronic disorder causing swelling in the abdomen just behind the legs and under the vent. Usually the poop has yellow mucous in it, and it is a puddle not a well formed turd.
Water belly (ascites) is from liver failure and this also is pretty well defined as a large swelling between and in front of the legs. It usually pushes the legs apart in a wide stance. The chicken will walk like a duck or penguin as a result. I had a hen with ascites and her belly actually dragged on the ground as she walked. Again, there is no doubt or guessing with water belly. The symptoms are very distinctive. Poop may also be yellow, maybe greenish from bile.
None of these cause the sound this hen is making. A crop full of liquid with some of the liquid overflowing into the throat is usually the cause of such a sound. Whether or not the full crop is from a crop disorder (yeast) or just from drinking a lot of water at once remains to be determined. You can identify a crop disorder easily by checking it first thing in the morning before the chicken eats or drinks. If the crop is full instead of emptying completely over night, then you have a crop disorder that needs to be treated.
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/
