Cat Throwing Up Yellow Stuff. My cat is throwing up. Cat throwing up white foam:

It can be anything from plant ingestion, dietary change, dietary indiscretion, foreign body ingestion, metabolic disease such as diabetes mellitus, kidney failure, or inflammatory bowel disease just to name a few. This typically means they are vomiting on an empty stomach and not because of something they ate. And if the vomit is green, this may be the result of bile being mixed in too.