Blocked Cat: What It Means and When It’s an Emergency (FLUTD)

By Animal Emergency of Sandy Springs | January 16, 2026

Feline Lower Urinary Tract Disease (FLUTD) in Emergency Medicine

It is a Saturday evening, and you are getting ready for a night in Midtown Atlanta when you notice that your cat has gone in and out of the litter box multiple times within 45 minutes. He has been meowing more than usual and appears uncomfortable. Because your regular veterinarian is closed, you take your cat to the emergency veterinarian, where you are told that your cat is blocked.

What does this mean?

What Does It Mean When a Cat Is Blocked?

When a cat is blocked, it means they are experiencing a condition known as urethral obstruction. This occurs when there is a blockage in the urethra that prevents normal urination.

This condition is most commonly associated with Feline Lower Urinary Tract Disease (FLUTD). FLUTD affects up to 500,000 cats in the United States each year and is commonly seen in veterinary hospitals. In cats with FLUTD, crystals can form in the urine and contribute to inflammation, irritation, and obstruction of the urethra.

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Causes and Risk Factors for FLUTD

The exact cause of Feline Lower Urinary Tract Disease is not known; however, stress appears to be highly correlated with this condition.

Common stressors include:

  • Moving to a new home

  • Introduction of a new pet

  • Inter-cat aggression

Additional risk factors include:

  • Feeding an exclusively dry food diet

  • Being an indoor-only cat

  • Obesity

Male cats are more likely to experience urethral obstruction than female cats due to anatomical differences. Middle-aged cats, typically between 2 and 6 years old, are most commonly affected.

FLUTD vs. Urinary Tract Infection

Feline Lower Urinary Tract Disease is commonly misdiagnosed as a urinary tract infection. However, these cases are typically sterile, meaning there are usually no bacteria present in the urinary bladder.

When a urine sample is examined under a microscope, it often contains increased numbers of red and white blood cells. This occurs because urinary crystals cause inflammation and irritation of the bladder lining. Blood cells and inflammatory debris can combine with crystals to form a thick sludge that may obstruct the urethra and prevent normal urination.

Why a Blocked Cat Is a Medical Emergency

The inability to urinate is a medical emergency and can be life-threatening if not treated promptly.

Treatment requires sedation and pain control for the placement of a urinary catheter to relieve the obstruction. Cats are typically hospitalized for at least 24 hours with intravenous fluids. The urinary catheter is left in place to help flush debris from the bladder and allow inflammation within the urethra to resolve.

Cats with urethral obstruction may experience electrolyte imbalances, elevated kidney values, and moderate to severe pain. Hospitalization allows for fluid therapy, pain management, electrolyte supplementation, and close monitoring.

Preventing Urethral Obstruction

Prevention of urethral obstruction is typically multi-factorial.

Diet plays an important role in reducing crystal formation. Prescription urinary diets may be recommended to help maintain appropriate urine pH and reduce the risk of recurrence. A urinary diet is often recommended long-term after a diagnosis of Feline Lower Urinary Tract Disease.

Managing stress within the home is also important and may include:

  • Pheromone diffusers

  • Anti-anxiety medications when prescribed

  • Reducing known stressors

Encouraging adequate water intake helps promote hydration and frequent urination. This can be achieved by providing multiple water sources, mixing water into food, and feeding a canned urinary diet.

When to Seek Emergency Care

If your cat is at risk for Feline Lower Urinary Tract Disease, monitor closely for changes in urination habits. Frequent litter box visits, straining, vocalization, or producing little to no urine should prompt immediate veterinary evaluation.

Rapid veterinary intervention can be lifesaving. The team at Animal Emergency Center of Sandy Springs is available if you are concerned that your cat may be experiencing signs of FLUTD or urinary obstruction.

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