Feline Cholangitis: Signs, Diagnosis, and Treatment

Feline cholangitis and cholangiohepatitis are inflammatory diseases of the bile ducts and liver that rank among the most common liver problems in cats. Early signs are often vague — weight loss, reduced appetite, vomiting — but prompt diagnosis and treatment can lead to full recovery in many cases.

Last reviewed: June 2026

What Is Feline Cholangitis / Cholangiohepatitis?

Cholangitis means inflammation of the bile ducts; cholangiohepatitis means that inflammation has spread into the surrounding liver tissue. Together they form the feline cholangitis/cholangiohepatitis complex (CCHC), one of the most frequently diagnosed hepatobiliary disorders in cats. Vets recognise three main forms:

Form	Cause	Typical patient	Prognosis
Neutrophilic (acute)	Bacterial infection, often ascending from intestine	Middle-aged to older cats	Good with antibiotics
Neutrophilic (chronic)	Persistent bacterial inflammation	Older cats	Fair to good
Lymphocytic	Immune-mediated; exact trigger unknown	Middle-aged cats	Variable; long-term management common

As described in Ettinger's Textbook of Veterinary Internal Medicine, the neutrophilic form most often results from bacteria ascending the common bile duct from the duodenum, whereas the lymphocytic form is believed to reflect a progressive immune dysregulation that may coexist with inflammatory bowel disease and pancreatitis — a triad called "triaditis."

What Are the Signs of Cholangitis in Cats?

The signs are rarely specific to the liver on their own, which is why owner vigilance and vet evaluation matter.

Most common signs:

• Reduced appetite or complete refusal to eat — often the first sign owners notice
• Weight loss over weeks to months
• Vomiting, sometimes daily; may bring up bile or undigested food
• Lethargy and reduced willingness to play or interact
• Jaundice (icterus) — yellowing of the whites of the eyes, gums, and inner ear flaps; signals significant liver compromise
• Increased thirst and urination in some cats
• Painful or distended abdomen when the vet presses the belly

Less common:

• Fever (especially in the neutrophilic acute form)
• Ascites (fluid accumulation in the abdomen) in severe cases
• Neurological signs (hepatic encephalopathy) if liver failure develops

A cat that is jaundiced AND has not eaten for more than 48 hours is at high risk of developing secondary hepatic lipidosis — a serious complication that compounds the liver disease.

Gagne et al., 1996, JVIM characterised the clinical and histological features of cholangiohepatitis in 63 cats, finding jaundice in approximately 50% and neutrophilic infiltrates as the predominant form, with a significant proportion also showing concurrent pancreatitis or IBD.

How Do Vets Diagnose Cholangitis?

Diagnosis requires combining bloodwork, imaging, and often a tissue sample, because clinical signs do not reliably distinguish between forms.

Step-by-step workup:

1. Blood chemistry panel — elevated ALT, ALP, total bilirubin, GGT; hypoalbuminaemia in severe or chronic cases
2. Complete blood count — neutrophilia with a left shift in bacterial neutrophilic cholangitis; lymphocytosis in some chronic cases
3. Urinalysis — bilirubinuria is often the earliest biochemical clue
4. Abdominal ultrasound — can show gallbladder thickening, bile duct dilation, hepatomegaly, or concurrent pancreatitis; not definitive on its own
5. Liver biopsy (needle or surgical) — definitive; also allows bile culture in neutrophilic cases
6. Bile culture — bacteria found in 30–50% of neutrophilic cases; guides antibiotic choice

An abdominal ultrasound is almost always performed before biopsy to identify safe sites and rule out mass lesions.

Treatment: What to Expect

Treatment differs by form, which is another reason biopsy matters.

Neutrophilic (bacterial) cholangitis:

• Antibiotics chosen by bile culture or empirically (amoxicillin-clavulanate or fluoroquinolones are common starting points)
• Duration typically 4–8 weeks, sometimes longer
• Ursodeoxycholic acid (ursodiol) — a bile acid that reduces bile toxicity and has mild anti-inflammatory effects, as detailed in Plumb's Veterinary Drug Handbook; used as adjunctive therapy in most forms
• Supportive care: IV fluids if dehydrated, anti-nausea medications, appetite stimulants

Lymphocytic cholangitis:

• Corticosteroids (prednisolone) are the mainstay; often continued long-term at the lowest effective dose
• Ursodiol added as adjunctive therapy
• SAMe and milk thistle (silymarin) are often used as hepatoprotectants; evidence base is limited but safety profile is acceptable

Nutrition:

• High-quality, easily digestible protein diet; protein restriction is no longer recommended unless hepatic encephalopathy is present
• Assisted feeding (syringe or feeding tube) if the cat refuses food for more than 48–72 hours — critical to prevent secondary hepatic lipidosis

Otte et al., 2021, JFMS reviewed outcomes in cats with lymphocytic cholangitis treated with prednisolone and found that over 60% achieved clinical remission with long-term low-dose steroid management, though relapses were common when medication was discontinued prematurely.

The AAFP-AAHA Feline Life Stage Guidelines, 2021 emphasise regular senior wellness bloodwork as the key to catching liver enzyme elevations before overt signs develop.

Prognosis

Acute neutrophilic cholangitis caught early and treated aggressively carries a good-to-excellent prognosis — most cats recover fully with 4–8 weeks of antibiotics and supportive care. Chronic neutrophilic and lymphocytic forms require lifelong management in many cats, with periodic relapses possible. Cats that develop hepatic lipidosis as a complication have a more guarded outcome that depends largely on how quickly nutritional support is started.

When to See a Vet

Call your vet today if:

• Your cat has been eating less or not at all for more than 48 hours
• Your cat is losing weight without an obvious cause
• Your cat is vomiting more than once or twice a week
• Your cat seems more lethargic than usual and is sleeping far more than normal

Go to the ER immediately if:

• You notice yellow coloring in your cat's eyes, gums, or ear skin (jaundice)
• Your cat has not eaten at all for 48+ hours AND is also vomiting
• Your cat is in obvious pain when you touch the belly area
• Your cat is pressing its head against walls or showing sudden disorientation (possible hepatic encephalopathy)

Frequently Asked Questions

What causes cholangitis in cats? The neutrophilic (bacterial) form usually arises when intestinal bacteria ascend the bile duct into the liver. The lymphocytic form is thought to be immune-mediated — the immune system attacks liver bile duct cells for reasons that are not fully understood. Concurrent inflammatory bowel disease or pancreatitis is common, suggesting a shared inflammatory environment across abdominal organs.

Can cholangitis in cats be cured? Acute neutrophilic cholangitis often resolves completely with several weeks of antibiotics. Lymphocytic cholangitis and chronic neutrophilic disease typically require long-term management rather than a cure. Many cats live comfortably for years with appropriate medication and monitoring, though periodic bloodwork is needed to catch relapses early.

How much does treating cholangitis cost? An initial vet exam and baseline bloodwork typically cost $150–400 combined. Abdominal ultrasound adds $300–600; liver biopsy under sedation or general anaesthesia adds $500–1,200 depending on method. Ongoing antibiotics or prednisolone typically run $30–80 per month. Hospitalization with IV fluids, if needed, adds $300–600 per day. Early diagnosis significantly reduces the overall bill.

Is cholangitis contagious to other cats? No. The lymphocytic form is immune-mediated and not contagious. The neutrophilic form involves gut bacteria that ascend from the cat's own intestine — this is not spread between cats by contact.

What bloodwork changes signal liver disease in cats? Elevated ALT (alanine aminotransferase) and ALP (alkaline phosphatase) are the first clues on a routine chemistry panel. Elevated total bilirubin and GGT indicate more serious bile duct involvement. A urinalysis showing bilirubinuria often precedes visible jaundice. Any senior cat should have these values checked at least annually.

Can diet help manage cholangitis? Yes. A highly digestible, moderate-to-high quality protein diet supports liver function without over-burdening it. Forced protein restriction is no longer recommended unless hepatic encephalopathy is present. Consistent nutrition also prevents secondary hepatic lipidosis, which remains a major complication risk in any cat eating poorly.

Still Not Sure if Your Cat Needs a Vet?

When you're not sure if this is wait-and-see or call-tonight, Voyage AI Vet triages in under 2 minutes. Describe what you're seeing in chat, share photos of your cat's eye whites, gum color, or belly shape, or hop on a live video call if you want a second pair of eyes. Every answer comes with citations to the actual veterinary literature it's pulling from — so you see exactly where the guidance comes from, not just a chatbot's word.

Start a triage →