Cat UTI symptoms UK: 7 early signs every owner should know (2026 guide).

If you've typed "cat UTI symptoms" into Google at 10pm, this is the article for you. Short version: cats hide UTIs almost completely until they can't. Below are the seven earliest signs UK owners ask about most — and what each one actually means.

What is a UTI in a cat?

A feline urinary tract infection (UTI) is a bacterial infection of the bladder or urethra. In the UK it most often presents as part of FLUTD (Feline Lower Urinary Tract Disease), which also covers cystitis, bladder stones and — in male cats — urethral blockage. Untreated, a UTI can progress to a blockage in 48–72 hours. A blocked male cat is a true emergency.

The 7 earliest cat UTI symptoms UK owners ask about

• Visiting the litter tray more often than usual — even by one or two extra trips a day. This is the very first sign and the one almost everybody dismisses.

• Straining in the litter box but producing very little urine. If your cat squats for a long time and only a small drop comes out, treat it as urgent — especially in a male cat.

• Blood in the urine, or a pink/red tinge in the litter. Often invisible in clay litter; obvious in colour-changing health litter.

• Crying, meowing or whining while urinating. By this stage the infection is well established.

• Excessive grooming of the genital area or belly — long, focused sessions that look like normal cleaning but aren't.

• Urinating outside the litter tray (on rugs, the bath, the floor). Cats associate the tray with pain and try somewhere new.

• Lethargy, hiding, or eating less. The non-specific signs of feeling unwell that cats show last.

When to call a UK vet

Call the same day if you see any combination of two of the above signs, or any single sign in a male cat. Call the out-of-hours emergency vet immediately if your cat is straining and producing nothing, vocalising in pain, or vomiting — these are signs of a urethral blockage and the timeline is hours, not days.

How much does cat UTI treatment cost in the UK?

Caught early — typically £40–£90 for a consultation, urine test and a course of antibiotics. Caught late, with a blockage, expect £800–£2,500 for emergency catheterisation, hospitalisation and follow-up. Pet insurance with urinary cover usually pays out, but excesses still bite. The single biggest variable in what you pay is when you caught it.

How to spot a cat UTI before the symptoms

The chemistry of a cat's urine — pH and blood — changes days before behaviour does. Standard clay or silica litter throws that information away. Kittydoctor health-monitoring litter uses colour-changing crystals that turn blue when pH shifts (a UTI marker) and red on contact with even microscopic blood. You scoop, you look, you know — every morning, in ten seconds.