Symptoms2026-03-09Carelogy編集部
Inflammatory Bowel Disease (IBD) in Cats: Chronic Vomiting & Diarrhea Management
IBD in cats: understanding chronic vomiting and diarrhea, biopsy diagnosis, steroid treatment, and long-term dietary management.
The Bottom Line: Vomiting Multiple Times a Month Is NOT Normal
Do you believe "cats just vomit a lot"? In reality, vomiting more than twice a month is abnormal and may signal a gastrointestinal disorder, including inflammatory bowel disease (IBD).
IBD is one of the leading causes of chronic digestive symptoms in cats, and proper diagnosis and treatment can dramatically improve quality of life. If your cat has been dealing with ongoing vomiting, diarrhea, or weight loss, it is time to have a conversation with your veterinarian.
Symptoms and Progression of IBD
Typical symptoms:
- Chronic vomiting: Once a week or more, lasting weeks to months
- Chronic diarrhea: Persistent soft or watery stools
- Weight loss: Gradual, even when appetite is maintained
- Appetite changes: Usually decreased, but sometimes increased
- Rumbling gut sounds: Indicating hyperactive intestinal motility
Characteristic course: IBD tends to wax and wane, gradually worsening over time. The classic pattern is "things seemed fine for a while, then the vomiting started again."
Important: IBD and intestinal lymphoma share very similar symptoms. A biopsy is required to tell them apart with certainty.
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The Diagnostic Process
Diagnosing IBD is fundamentally a process of exclusion — ruling out other conditions step by step.
Step 1: Blood work, urinalysis, and fecal tests to exclude parasites, kidney disease, hyperthyroidism, pancreatitis, and other conditions.
Step 2: Abdominal ultrasound to check for thickened intestinal walls and enlarged lymph nodes.
Step 3: Endoscopic biopsy is the gold standard. Under general anesthesia, small tissue samples are collected from the intestinal lining and sent for histopathology. This step is also essential for differentiating IBD from intestinal lymphoma.
The total cost of a full diagnostic workup typically ranges from roughly $350 to $1,000, depending on your location and the tests performed.
Treatment and Long-Term Management
Dietary therapy (first-line treatment):
- Novel protein diet: A prescription food containing a protein your cat has never eaten before (venison, kangaroo, etc.)
- Hydrolyzed protein diet: Proteins broken down into tiny fragments that are less likely to trigger an immune reaction
- A strict 6-to-8-week food trial is needed to evaluate the response
Medications:
- Prednisolone (corticosteroid): Used when inflammation is significant. Treatment starts at a high dose and is gradually tapered
- Budesonide: A locally acting steroid with fewer systemic side effects
- Chlorambucil: An immunosuppressant added when steroids alone are not enough
- Vitamin B12 supplementation: Chronic intestinal inflammation impairs B12 absorption, so injections or high-dose oral supplements are often needed
For most cats, a combination of dietary therapy and steroids achieves good long-term symptom control.
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IBD慢性嘔吐慢性下痢消化器猫の病気
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