Skip to content
For Dogs · WOOPF™, opens in a new tabCare about your pet? Download ASK A VET!For Cats · PURRZ™, opens in a new tab
ASK A VET
Grey cat in an open pink carrier beside a veterinary professional.
All articles
Ask A Vet
  • Exotic Animal Care
  • Large Animal Care
  • Nutrition
  • Pet Care
  • Tech & Tracking
  • Vet Tips

Title: Vet’s Guide to Hydronephrosis in Cats: Causes, Symptoms & Treatment in 2025 🐾

🐱💧 *Understanding* hydronephrosis in cats is crucial in 2025. Learn about its causes, symptoms, diagnosis, and treatment to ensure your feline's kidney health. 🐾🩺

Duncan Houston
Duncan Houston
Veterinarian · Founder of ASK A VET
5 min read

Vet’s Guide to Hydronephrosis in Cats: Causes, Symptoms & Treatment in 2025 🐾

As a veterinarian with years of experience, I understand how alarming it can be when your beloved feline companion faces health issues. One such condition is hydronephrosis, a serious kidney disorder. In this 2025 guide, we'll delve into its causes, symptoms, diagnosis, treatment, and prevention to help you ensure your cat's well-being. 🐱💧

What is Hydronephrosis? 🩺

Hydronephrosis refers to the swelling of a kidney due to a build-up of urine. This occurs when there's an obstruction in the urinary tract, preventing urine from draining properly from the kidney to the bladder. Over time, this can lead to kidney damage.

Causes of Hydronephrosis in Cats 🔍

Several factors can lead to hydronephrosis in felines:

  • 🔹 Urolithiasis (kidney or bladder stones)
  • 🔹 Tumors in the urinary tract
  • 🔹 Ureteral strictures (narrowing of the ureter)
  • 🔹 Congenital abnormalities
  • 🔹 Trauma to the urinary system
  • 🔹 Infections leading to inflammation and blockage
  • 🔹 Post-surgical complications, such as accidental ligation of the ureter during spaying

Recognizing the Symptoms 🐾

Early detection is vital. Watch out for these signs:

  • ⚠️ Decreased appetite (anorexia)
  • ⚠️ Increased thirst and urination
  • ⚠️ Vomiting
  • ⚠️ Abdominal pain or swelling
  • ⚠️ Lethargy
  • ⚠️ Blood in urine (hematuria)
  • ⚠️ Foul-smelling breath
  • ⚠️ Mouth ulcers

Diagnosis: How Vets Identify Hydronephrosis 🧪

Diagnosing hydronephrosis involves:

  • 🩺 Physical Examination: Checking for abdominal swelling or pain.
  • 🧬 Blood Tests: Assessing kidney function and detecting infections.
  • 💧 Urinalysis: Identifying abnormalities in urine.
  • 🖥️ Imaging: Ultrasounds or X-rays to visualize kidney enlargement or blockages.

Treatment Options 💊

Treatment depends on the underlying cause and severity:

  • 💉 Fluid Therapy: To address dehydration and support kidney function.
  • 🦠 Antibiotics: If infections are present.
  • 🪥 Surgical Intervention: To remove obstructions or correct anatomical issues.
  • 💊 Pain Management: Ensuring the cat's comfort during recovery.

Preventive Measures 🛡️

Prevention is always better than cure:

  • 🥣 Proper Diet: Feeding a balanced diet to prevent stone formation.
  • 💧 Hydration: Ensuring your cat has constant access to fresh water.
  • 🏥 Regular Vet Check-ups: Early detection through routine examinations.
  • 🚫 Avoiding Trauma: Keeping your cat safe from potential injuries.

Breed-Specific Insights 🐈

Some breeds may be more predisposed to urinary issues:

  • 🐾 Persian Cats: Known for a higher risk of kidney diseases.
  • 🐾 Maine Coons: May have genetic predispositions affecting kidney function.

Regular monitoring is especially crucial for these breeds.

Conclusion 📝

Hydronephrosis is a serious condition, but with timely intervention and proper care, affected cats can lead healthy lives. Stay vigilant, ensure regular veterinary visits, and maintain a healthy lifestyle for your feline friend. 🐾

For more personalized advice and support, visit AskAVet.com or download the Ask A Vet app today! 📱🐱

This article is general veterinary education and does not diagnose or treat an individual animal. Always confirm medication names, doses and interactions with the veterinarian who knows your pet.

If your animal is struggling to breathe, collapsed, bleeding heavily, seizing, or has eaten something toxic, contact your vet or the nearest emergency clinic now.

Animal Poisons Helpline (AU) 1300 869 738 · Animal Poisons Helpline (NZ) 0800 869 738 · ASPCA Animal Poison Control (US) (888) 426-4435

More from Ask A Vet

For everyday pet care, one scan or tap of the smart pet ID tag opens your pet's free profile on any phone, no app needed; the GPS pet tracker logs live location and activity trends; and the Ask A Vet app keeps your pet's records and routines together.

Try the calculatorHuman Years Calculator
Dr Duncan Houston
About the author
Dr Duncan Houston
Veterinarian · Founder of ASK A VET

Ask A Vet articles are written by Dr Duncan Houston BVSc, a practising veterinarian, unless another author is named in the byline.

Sign up for Ask A Vet news

Stay in the Pack

Get the latest news, vet-approved tips and early access to new gear — straight to your inbox.

By subscribing you consent to receive Ask A Vet marketing emails. Unsubscribe any time. See our Terms & Conditions and Privacy Policy. Your address is stored by Shopify and our email provider, Klaviyo.