Dog & cat health · Vet-reviewed guide

Cat UTI Symptoms: Signs to Watch and the Male-Cat Emergency

A cat straining in the litter box is easy to misread as constipation — and in a male cat, that mistake can be dangerous. Here's how to tell what's really going on.

Quick answer: The main cat UTI symptoms are straining in the litter box, blood in the urine, peeing outside the box, and making frequent trips that produce only a few drops. A cat may also cry while urinating or lick its genital area more than usual.

Here is the part that matters most: if your cat, and especially a male cat, is straining hard but passing little or no urine, that is a potential urinary blockage and a true emergency. A blocked cat can develop kidney failure or die within about 24 to 48 hours, so it needs a vet immediately, not a home remedy or a wait-and-see approach. Because you cannot tell a simple UTI from a dangerous blockage at home, and because many feline urinary problems are not even caused by bacteria, any straining or blood in the urine is a reason to call a vet. This guide covers the signs and, above all, when to treat it as an emergency.

Emergency: A cat straining in the litter box with little or no urine coming out, crying in pain, or lethargic and vomiting, may have a life-threatening urinary blockage. Go to a vet or emergency clinic right now. This is most common in male cats.

Related: cat uti treatment

Common symptoms of a cat UTI

• Straining or spending a long time in the litter box
• Blood in the urine, or pink or red-tinged litter clumps
• Urinating outside the litter box, often in cool smooth spots like sinks or tubs
• Frequent trips that produce only small amounts
• Crying or vocalizing while trying to urinate
• Excessive licking of the genital area
• In more serious cases, lethargy, vomiting, or hiding¹

The male-cat emergency: urinary blockage

Male cats have a long, narrow urethra that can become completely blocked by crystals, mucus, or a plug, and then no urine can pass at all.² This is one of the most time-critical emergencies in cats. Warning signs are repeated straining with nothing coming out, crying in the box, a tense or painful belly, and later, vomiting, collapse, or extreme lethargy. If you see these, do not wait, and do not try any home treatment. Caught early, most cats survive; left too long, a blockage is quickly fatal.

Why you can't treat this at home

Two reasons. First, straining from a simple UTI and straining from a deadly blockage look the same from the outside, and only a vet can tell them apart.² Second, many cats with these signs do not actually have a bacterial infection at all; a large share of feline urinary disease is inflammatory or stress-related, which antibiotics do not fix. Home remedies such as apple cider vinegar do not treat any of this and waste time you may not have.

What the vet does

A vet examines your cat, checks whether the bladder is full and firm, and runs a urine test to find the real cause. Treatment depends on that cause: relieving a blockage is an emergency procedure, a true bacterial infection gets a prescribed antibiotic, and stress-related cystitis is managed differently.¹ When an antibiotic is appropriate, the right one must be chosen by a vet. If your cat needs a prescription, our licensed veterinarians can review your cat and issue one when appropriate. See how our vet prescription service works.

If you're worried about cost

Urinary emergencies are frightening on cost as well as health, but a blockage will not resolve itself and delay makes it far more dangerous and expensive. Call local emergency clinics and shelters about options, and be with them about your budget; getting your cat seen is what saves its life.

The bottom line

Any cat that is straining, passing blood, or going outside the box should see a vet, and a cat that cannot pass urine needs emergency care immediately.² When in doubt, treat straining as an emergency, because with a possible blockage, it is safer to be wrong about a UTI than to wait on a block.