An Overview of Urethral Obstruction

Signs of Urethral Obstruction in Cats

An overview of urethral obstruction

Urethral obstruction, commonly known as a urinary blockage, is a life-threatening condition that occurs primarily in male cats.

The urethra is the tube that carries urine from the bladder to the outside of the body. In male cats, the urethra is longer and narrower, making it more prone to blockage.

A urethral obstruction occurs when this tube becomes wholly or partially blocked, preventing urine from exiting the bladder.

This blockage can result from urinary crystals, bladder stones, or mucous plugs formed by inflammatory debris.

Left untreated, urethral obstruction can cause the bladder to overfill, leading to pressure on the kidneys and life-threatening consequences.

Urethral Obstruction in Cats

Signs of urethral obstruction in cats

Cats with urethral obstruction often make repeated trips to the litter box but cannot pass urine or only pass small amounts.

Your cat may strain or cry out in pain when attempting to urinate.

This behaviour can sometimes be mistaken for constipation.

You may notice blood in the small amounts of urine that the cat can pass. This is a sign of bladder irritation and inflammation.

Factors that increase the risk of urethral obstruction include:

  • Diets high in magnesium or phosphorus
  • Dehydration, which concentrates minerals in the urine
  • Obesity, which can limit movement and hydration
  • Stress, which can contribute to urinary inflammation
  • Infections or bladder inflammation (Feline Lower Urinary Tract Disease, FLUTD)
Cats with urethral obstruction

Cats may excessively groom or lick their genital area due to pain or discomfort. As the blockage persists, the cat may become lethargic, lose interest in food, and show signs of general malaise.

Vomiting is a common symptom of advanced urethral obstruction, which occurs when toxins build up in the bloodstream, and the kidneys cannot filter waste.

Factors that increase the risk of urethral obstruction include:

  • Diets high in magnesium or phosphorus
  • Dehydration, which concentrates minerals in the urine
  • Obesity, which can limit movement and hydration
  • Stress, which can contribute to urinary inflammation
  • Infections or bladder inflammation (Feline Lower Urinary Tract Disease, FLUTD)
Urinary blockage in cats

When to seek immediate vet care

Urethral obstruction is a medical emergency, and delaying treatment can be fatal. Emergency symptoms include:

  • Complete inability to urinate: If your cat cannot pass urine, seek immediate veterinary attention.
  • Distended or firm abdomen: A full bladder may cause the abdomen to feel hard or swollen.
  • Severe lethargy or collapse: As toxins accumulate in the bloodstream, your cat may become unresponsive or collapse.
  • Rapid heart rate or difficulty breathing: Electrolyte imbalances, particularly high potassium levels, can lead to life-threatening heart arrhythmias.

Preventing urethral obstruction

While some cats may be genetically predisposed to developing urinary blockages, several preventive steps can reduce the risk:

Dietary Management: Feeding your cat a vet-recommended diet that is low in magnesium and promotes urinary health is crucial. Special urinary diets help dissolve crystals and reduce the formation of stones.

  • Hydration: Provide fresh water daily or use cat fountains to encourage your cat to drink plenty of water. Wet (canned) food can also increase water intake.
  • Weight Management: Obesity increases the risk of urinary blockages. Keeping your cat at a healthy weight through proper diet and exercise can prevent the condition.
  • Stress Reduction: Stress is a known factor in urinary conditions like FLUTD. Create a calm environment for your cat by enriching, reducing stressors, and ensuring a consistent daily routine.
  • Litter Box Hygiene: Maintain clean litter boxes to encourage regular urination. An unclean litter box can cause cats to hold their urine, increasing the risk of crystals forming in the bladder.

Treatment options for urethral obstruction

Immediate vet intervention is required to relieve the obstruction. Treatment steps typically include:

  • Stabilisation: If the cat is in shock or has severe electrolyte imbalances, stabilization with IV fluids and medications will be the first priority.
  • Catheterisation: The primary goal is to relieve the obstruction by passing a urinary catheter into the urethra to allow urine to flow. This procedure usually requires sedation or anesthesia. The catheter may be left in place for 24-72 hours to allow the bladder to drain thoroughly and reduce inflammation.
  • Flushing the Bladder: The bladder is often flushed with sterile fluid to remove crystals, stones, or debris that may still be present.
  • Surgical Intervention (Perineal Urethrostomy): In cats that experience repeated blockages, surgery called perineal urethrostomy (PU) may be recommended. This procedure involves permanently widening the urethral opening to prevent future obstructions.
  • Post-Obstruction Monitoring: After the obstruction is relieved, cats must be closely monitored for kidney function, electrolyte imbalances, and urinary output.

Caring for your cat after surgery or treatment

  • Medication: After catheterisation or surgery, your cat may be prescribed antibiotics to prevent infection and pain medications to manage discomfort. Anti-inflammatory medications may also be given to reduce swelling in the urethra.
  • Dietary Adjustments: To prevent future blockages, switching to a prescription urinary diet may be recommended. These diets are specially formulated to dissolve existing crystals and prevent the formation of new ones.
  • Monitoring Urination: After surgery or catheterisation, monitor your cat’s urination habits closely. Ensure that your cat is urinating regularly and without signs of pain.
  • Fluid Intake: Encourage your cat to drink water by offering fresh, clean water in multiple locations around your home. Wet food can also help increase water intake.
  • Activity and Stress Management: After surgery, provide a quiet and comfortable space for your cat to recover. Keep stress levels low and limit strenuous activity during the healing process.

Urethral obstruction is a serious condition that requires immediate vet attention. Recognising the signs early and taking preventive steps—such as feeding a proper diet, ensuring hydration, and managing stress—can reduce the risk of recurrence. With prompt treatment and careful post-surgery care, cats suffering from urethral obstruction can recover and go on to live healthy, comfortable lives. Regular monitoring and preventive strategies are key to maintaining long-term urinary health in cats prone to this condition.

Are you worried about your cat’s health?

If you are concerned about your cat, please reach out to our friendly team. Call us on 1300 228 377 or fill out the contact form below. In an emergency, please contact your local vet.

For vets – to refer a patient or book a telehealth consultation, please call us on 1300 228 377, book through the portal or fill in the form.

Patient Stories

Our commitment to feline health is best seen in the stories of the cats we’ve had the privilege of treating. These journeys highlight the dedication, expertise and compassion that drive us.

Each patient faced unique challenges, and it was our honour to offer high-quality care and help them regain strength and happiness. We value the deep bonds with cats and their owners, knowing the difference we make in their lives.

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Contacting Us

Pet Owners
If you would like to talk about treatment for your cat, call us on 1300 228 377 or fill in the form.
In an emergency, please contact your local vet.

Vets and Nurses
To refer a patient or book a telehealth consultation please call us on 1300 228 377, book through the portal or fill in the form. For advice calls, please see the guidelines here.

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