My cat has a bloated belly, please help?

Hey there, I own a black male of over 1 year. Today, as usual he rapidly ate the breakfast, but what's surprising is he's not even touching the lunch. I noticed he has a bloated belly and seems lethargic... I thought of taking him to the vet ASAP, but it's Sunday and the vet's closed. He went out now. He's mostly indoors, but sometimes we do let him out. Now he's gone outdoors. Please help... keeping fingers crossed



P.S. His litter box is full and it doesn't look like urinary stones.

My cat had that once careful if she starts get disoriented or not rite he intestant could be swallowing itself or he stomach could have flipped.it is more known for dogs but happened to my cat she had to have surgery first time my vet did one on a cat she was 6 at the time she 15 now still plays and is active as hell lol was worth it but if she not acting funny or out of it or it doesn't get bigger may be nothing buy hard stool my older dog just passed from a tumor on her spline we never knew was there so just moniter the cat closely

It would be best to keep him indoors, if possible, so you can observe him. When cats are ill they frequently try to hide. If he hid outdoors you may not be able to find him. Could the bloating have been there before he ate?  You said his litter box was full, does that mean that he has pooped recently? Swallowing something he shouldn't, like a string, especially at his age, is a real concern, as a blockage can present as bloating. There are just so many possible causes.