Cat Urinary Tract Infection (UTI): Symptoms, Causes & Treatment

A cat crouching over the litter box, straining and producing almost nothing, is one of the most important signs a pet parent can learn to spot. Urinary problems in cats range from irritating to genuinely life-threatening, and they often look similar at first. Here's how to recognise a cat urinary tract infection (UTI), what causes it, how vets diagnose and treat it, and the red flags that mean you shouldn't wait.

What is a cat UTI?

A urinary tract infection happens when bacteria travel up the urethra and multiply in the bladder, causing inflammation and discomfort. In cats, though, true bacterial UTIs are less common than in dogs — especially in younger cats. Many urinary symptoms in cats actually stem from feline lower urinary tract disease (FLUTD), an umbrella term that includes bladder inflammation (cystitis), crystals, bladder stones and, in some cases, dangerous blockages. Because the symptoms overlap so heavily, it's important to have a vet pinpoint the exact cause rather than assume it's a simple infection.

Symptoms and signs of a cat UTI

Cats are experts at hiding illness, so the signs can be subtle at first. Watch for:

• Straining to urinate or spending a long time in the litter box
• Producing only small amounts of urine, or frequent trips with little result
• Blood in the urine, giving it a pink or reddish tinge
• Crying, meowing or showing discomfort while trying to go
• Peeing outside the litter box, often on cool surfaces like tile, sinks or bathtubs
• Excessive licking of the genital area
• Cloudy or strong-smelling urine
• Irritability, hiding, or reduced appetite

Common causes

Several factors can trigger urinary problems in cats. Bacterial infection is one, but the picture is often broader:

Bacterial infection

More common in older cats and those with conditions like diabetes or kidney disease, which change the urine and make infection easier.

Stress and idiopathic cystitis

Stress is a major trigger of bladder inflammation in cats. Changes at home, new pets, or disrupted routines can spark flare-ups even without any infection present.

Crystals and bladder stones

Mineral crystals or stones irritate the bladder lining and, in male cats, can lodge in the narrow urethra and cause a blockage.

Diet and dehydration

Low water intake produces concentrated urine that encourages crystals and irritation. Cats on all-dry diets are especially prone. Encouraging drinking with a pet fountain and urinary-support products is a simple protective step.

How vets diagnose it

Because the causes overlap, your vet will usually start with a urinalysis to look for blood, bacteria, crystals, pH changes and concentration. A urine culture confirms a true bacterial infection and identifies the right antibiotic. If stones or a blockage are suspected, imaging such as X-rays or ultrasound may be used, along with bloodwork to check kidney function — particularly important if a blockage has been present for any length of time.

Treatment and management

Treatment depends entirely on the underlying cause, which is why an accurate diagnosis matters so much:

• Antibiotics for a confirmed bacterial infection, given for the full prescribed course.
• Pain relief and anti-inflammatories to ease discomfort and reduce straining.
• Dietary changes — prescription urinary diets can dissolve certain crystals and reduce recurrence.
• Increasing water intake with wet food, fountains and multiple water stations.
• Stress reduction for idiopathic cystitis, including calming aids and environmental enrichment.
• Emergency catheterisation or surgery if a blockage or stones are present.

Prevention

You can meaningfully lower the risk of urinary problems returning. Encourage drinking with fresh water, a fountain and wet food. Keep litter boxes clean and provide one more box than the number of cats. Reduce stress with predictable routines, hiding spots and vertical space. Maintain a healthy weight, and if your cat has had crystals or stones, stick to any prescribed urinary diet. Regular checkups help catch changes early, especially in senior cats.

When to see a vet

Any straining, blood in the urine, or sudden litter box changes deserve a vet visit. But treat it as a true emergency — especially in male cats — if your cat is straining repeatedly and producing little or nothing, crying out, vomiting, lethargic, or has a firm, painful belly. A urinary blockage can become fatal within 24 to 48 hours, so don't wait until morning if these signs appear.

Frequently asked questions

Can a cat UTI go away on its own?

It's risky to wait it out. Some mild bladder irritation may settle, but a true bacterial infection usually needs antibiotics, and untreated urinary problems can worsen quickly. In male cats especially, straining can signal a life-threatening blockage. It's safest to have any urinary symptoms checked by a vet rather than hoping they resolve on their own.

Why is my cat peeing outside the litter box?

A cat that suddenly pees outside the box, often in small amounts or in cool spots like sinks and tiles, is frequently signalling a urinary problem such as a UTI or feline lower urinary tract disease. The urgency and discomfort make them associate the box with pain. Because it can also point to a blockage, a sudden change in litter box habits should be checked by a vet promptly.

When is a cat UTI an emergency?

Treat it as an emergency if your cat, especially a male, is straining repeatedly and producing little or no urine, crying in the litter box, vomiting, lethargic, or has a firm painful belly. These can signal a urinary blockage, which is life-threatening within 24 to 48 hours and needs immediate veterinary care.

This guide is educational and not a substitute for professional veterinary care. If you're worried about your cat, contact your vet.