This will depend on the type of fish you have, as some have round fat bodies.
If it is not due to the type of fish, then it is possible that your fish is constipated. To help your fish, you should fast it for 3 days, then feed it cooked de-shelled peas twice a day for 3 days (this will only be a few peas). This should help your fish poo and may reduce swelling if constipation was the cause.
Actually, goldfish do have a stomach, but it's very small, probably about the size of one of their eyes.
contrary to popular belief, most goldfish do not have a stomach!
Goldfish
Yes, goldfish have a full digestive system, including a stomach.
GOLDFISH
No, but they do have a very small stomach, which is why many people think they have no stomach at all.
she is probably pregnant.
You're a spastic.
Goldfish
no. Once you swallow something it goes to your stomach where it is digested. Hydrochloric acid in your stomach then dissolves it.
No. Like all members of the carp family, goldfish can survive in a wide range of water temps.
no they don't have air in their stomach's. It just looks like they're burping when they swallow water