Catnip For Cat Upset Stomach. The most common cause of gastritis in cats is food intolerance. When your cat is suffering from an upset stomach, one of the best remedies to try is the simplest:
“possibly the cat ate something it shouldn’t have, like a bug or a leaf of a plant.” Each cause will be accompanied by its own symptoms. To use catnip for cats, crush the herb’s leaves into a fine powder.