Ascitis, the unknown
- 3 days ago
- 2 min read
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Ascites in cats is one of those clinical findings that looks straightforward—big belly, fluid wave, dyspnoea—but the cause is often not what people expect, and sometimes not what even experienced owners initially assume.
The key point:
Ascites is not a diagnosis. It’s a symptom, and the underlying causes range from the obvious to the surprisingly .
🩺 The “usual suspects” (but not always the real cause)
These are the causes most owners (and many vets) jump to first:
- Heart failure – especially right-sided CHF
- Liver disease – cirrhosis, shunts, hepatic lipidosis
- Neoplasia – carcinomatosis, lymphoma, splenic/liver masses
- FIP – the classic “wet belly” presentation
These are common, but not the whole story.
🧩 The overlooked or unexpected causes of ascites
These are the ones that catch people out—especially when the cat looks otherwise “well”.
- Hypoalbuminaemia without obvious liver disease
- Protein-losing enteropathy
- Protein-losing nephropathy
- Severe malnutrition (elderly, dental pain, chronic illness)
- Chylous effusion
- Often mistaken for “infection” or “FIP”
- Can be due to lymphatic obstruction, cardiomyopathy, trauma, or idiopathic
- Internal bleeding (haemoabdomen)
- Can present with a surprisingly bright, interactive cat
- Splenic rupture, rodenticide toxicity, trauma, coagulopathy
- Uroabdomen
- Bladder rupture from obstruction or trauma
- Cats may not always be azotaemic yet—early cases can mislead
- Pancreatitis
- Can cause sterile inflammatory effusion
- Often missed because cats hide signs so well
- Right-sided heart disease without murmur
- HCM with occult right-sided involvement
- Pulmonary hypertension
- Heart disease in cats is notoriously silent
- Diaphragmatic hernia
- Chronic cases can mimic ascites on palpation or radiographs
- Severe anaemia
- Low oncotic pressure → third spacing
- Particularly in haemoplasma or chronic GI bleeding
🧪 Why fluid analysis is essential
Owners often assume “fluid = FIP” or “fluid = heart failure”, but the type of fluid tells you the story:
- Transudate → low protein states
- Modified transudate → heart disease, neoplasia, liver disease
- Exudate → infection, FIP, pancreatitis
- Chyle → lymphatic obstruction
- Blood → trauma, neoplasia, coagulopathy
- Urine → uroabdomen
A quick fluid tap can completely change the diagnostic direction.
🧠 The clinical trap
Cats with ascites often look “fat” or “pregnant”, and owners may delay seeking help.
But the cause is usually serious, and the earlier you identify it, the better the prognosis.
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