Unfortunately cats get nauseous for about 100000 reasons.

But you've got a couple of categories to help narrow things down.

GI problems- usually things like obstructions (partial or complete), parasites, dietary indiscretion, food allergies, IBD, GI cancer, etc.

Non-GI problems- liver, kidney, heart disease, hyperthyroidism (especially in an otherwise healthy cat).

Is Minnie eating, drinking, and using the litterbox normally? If so some of the more dread things like liver, kidney, and complete obstructive GI disease go lower on the list. But early GI cancer and IBD often start as minor changes and progress.

How old is Minnie? If she's young, I'd be worried about a string or some other dietary indiscretion. In older cats, I worry more about hyperthyroidism and cancer.

If she seems painful in the abdomen (just pick her up by the belly) then that is an emergency, as is straining at litter box (I've seen some female cats get urinary stones and block). Other than that, waiting until tomorrow as long as she is otherwise normal is OK.

Sorry I can't be more help. Working up the nauseous cat is not fun, but hopefully whatever it is can be resolved quickly, easily, and inexpensively. Please keep us posted on her. Good wishes!

Thanks for responding. I guess I shouldn't classify it as nausea because she's eating, drinking, using the litter box and resting comfortably. She doesn't look or act sick. She just gets up once in a while and gags, then up comes a quarter size of white foamy liquid.

She's a young cat, about 7.

I'm going to bring her in next week and I'll let you know if they find anything.

Thanks again.

Do you give her Petromalt or Laxitone for hairball prevention? Ask the vet if it might be a hairball that she can't get out.

Our cat yaks up white foam whenever she goes for a car ride (which is only ever to the vet)...

I was watching her eating last night and it appears she's having trouble chewing. I suspect teeth problems. So I'm bringing her to the vet tomorrow to get checked out. I'll let you know the outcome. Thanks everyone for your thoughts on this.

Wanted to let you know that I brought Minnie to the vet and she's actually there now. She had her teeth cleaned, but the vet didn't find anything out of the ordinary with her mouth or teeth. However, it appears she does have an upper respiratory infection that I didn't detect. We all know how well they hide their illnesses. Since Minnie is difficult to medicate, they are going to keep her for a few days to do just that. So it appears she doesn't have anything serious and will be fine.

Thanks so much for your help.