Note if your cat is drinking more or less than usual. Also, check the litter box to see how often it has been used and if the cat has diarrhea.
[header] How to help a vomiting cat [title] Note any changes to your cat's diet, thirst or behavior. [step] To determine why your cat is vomiting, think about changes to your cat's diet, thirst, and behavior. Start by remembering when and what your cat ate last.