Rather than being a condition in themselves, ulcers are actually a sign of another underlying condition. They are produced by an overabundance of gastric acid that erodes the gastrointestinal lining. A bacteria called Helicobacter pylori has been linked to many stomach ulcers. What causes tumor, however, isn't understood yet, although it is suspected that chronic stomach inflammation, often increased by ulcers, contributes to their growth.
Has your cat been under stress? Has she swalloed a sharp object or ingested a caustic substance? Does she have a metabolic or infectious disease? Has she been diagnosed with internal parasites? If so, this may signal a stomach ulcer or tumor. You may notice that your cats has no interest in food, has chronic vomiting and is lethergic. There are bits of curdled blood in the cat's vomit. The animal may have a painful abdomen and thus shrinks from being touched there. Her feces may be dark or even black, indicating the presence of blood.
Your veterinarian will perform an exam to determine whether ulcers or tumors are present. For ulcers, the underlying cause will be treated. If the Helicobacter pylori bacteria is present, an antibiotic may be prescribed. The cat will also receive medication to reduce the stomach acid, thus giving the ulcerated area a chance to heal. If tumors are present, your veterinarian may operate to remove them.