Common symptoms of feline intestinal lymphoma include the following:

• Decreased or no appetite
• Weight loss
• Vomiting
• Diarrhea
• Increased water consumption and urination
• Lumps on the side of the abdomen

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Of course, these symptoms are also present with a number of other feline disorders — especially inflammatory bowel disease — so a clinical diagnosis is necessary.

A veterinarian or veterinary oncologist will perform a biopsy and test cells from the tumor, and once the test results are back, he or she can determine whether your cat’s intestinal lymphoma is low-, intermediate- or high-grade.