[header] How to treat kidney disease in cats [title] Use medications to repair toxin damage to the stomach wall. [step] When a cat has kidney disease, there are raised levels of urea and phosphate in the blood, which are particularly irritating to the stomach lining and the gums. This may result in ulceration, which can be seen as inflamed, ulcerated tissue on the gums or tongue. 
It can also produce stomach ulcers. [substeps] If the cat is vomiting, and in particular if the cat is vomiting blood, it may be assumed that the cat is suffering from gastric ulcers.