FLUTD (Feline Lower Urinary Tract Disease)
Any male cat straining to urinate must be seen by a vet today — a blocked bladder is life-threatening. Female cats straining for hours with no urine also need urgent attention.
In the next 60 seconds
- If your cat is a male and is straining without producing urine, treat this as an emergency and go to the vet immediately — a blocked bladder can be fatal within 24–48 hours.
- Check the litter tray — are there any urine clumps? Even small ones? A completely empty tray despite frequent visits is a red flag for obstruction.
- Keep your cat calm and confined. Reduce stress in the immediate environment — quiet space, familiar bedding, familiar smells.
- Do not attempt to feel or press the abdomen to check the bladder — a distended bladder is extremely painful and fragile.
- Contact your vet by phone and describe the signs — frequency, any urine produced, any blood, whether your cat is male or female.
- For a female cat with mild signs (some urine still passing, no obvious distress), a same-day vet appointment is appropriate — monitor closely while waiting.
- For a male cat showing any straining: same-day, or emergency if out of hours.
Recognise the signs
- Frequent visits to the litter tray, often in short succession
- Straining to urinate — crouching position, visible effort with little or no urine produced
- Blood in urine (haematuria) — pink, red, or brown discolouration
- Urinating in unusual locations — outside the litter tray, on cool surfaces (tiles, baths), on laundry
- Excessive licking of the genital area
- Crying out while attempting to urinate
- Small amounts of urine passed — sometimes just a few drops
- Reduced appetite or lethargy if condition has persisted or pain is significant
- Male cats: complete inability to pass urine = EMERGENCY (blocked bladder) — seek immediate vet care
First aid steps
- If your cat is a male and is straining without producing urine, treat this as an emergency and go to the vet immediately — a blocked bladder can be fatal within 24–48 hours.
- Check the litter tray — are there any urine clumps? Even small ones? A completely empty tray despite frequent visits is a red flag for obstruction.
- Keep your cat calm and confined. Reduce stress in the immediate environment — quiet space, familiar bedding, familiar smells.
- Do not attempt to feel or press the abdomen to check the bladder — a distended bladder is extremely painful and fragile.
- Contact your vet by phone and describe the signs — frequency, any urine produced, any blood, whether your cat is male or female.
- For a female cat with mild signs (some urine still passing, no obvious distress), a same-day vet appointment is appropriate — monitor closely while waiting.
- For a male cat showing any straining: same-day, or emergency if out of hours.
Do NOT
- Do NOT wait overnight to see if a male cat's straining resolves — urethral obstruction is rapidly life-threatening.
- Do NOT press or squeeze the abdomen to try to express the bladder at home.
- Do NOT give paracetamol, ibuprofen, or other human pain relievers — toxic to cats.
- Do NOT assume a cat going outside the litter tray is a behaviour problem without ruling out FLUTD — inappropriate elimination is frequently medical in origin.
- Do NOT reduce water intake to try to help — hydration is protective. Encourage drinking instead.
While transporting to the vet
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When to phone the vet immediately
- Male cat: straining with no urine produced for more than 1–2 hours — emergency
- Cat is vomiting, collapse, crying, or shows signs of severe pain
- Complete absence of urine in the tray for more than 12 hours in a male cat
- Cat is increasingly lethargic or unresponsive
- Bloody urine combined with failure to urinate
- Bloated, hard, or painful abdomen
When it can usually wait
- Female cat with mild signs (small amounts of blood in urine, some straining) who is passing some urine and is otherwise bright and alert — still needs a same-day or next-morning appointment, not overnight delay
Common causes
- Feline Idiopathic Cystitis (FIC) — the most common cause (approximately 60–70% of FLUTD cases); no infection found; strongly linked to stress and environmental factors
- Urethral plugs — soft plugs of mucus, protein, crystals, and debris that partially or fully block the urethra; more common in male cats
- Urolithiasis (bladder stones) — struvite (magnesium ammonium phosphate) and calcium oxalate are most common in UK cats
- Bacterial urinary tract infection (UTI) — less common in cats than in dogs; more frequent in older cats, diabetic cats, or those with abnormal anatomy
- Anatomical abnormalities — urethral stricture (often following previous blockage and catheterisation), urethral diverticula
- Neoplasia — bladder tumours (transitional cell carcinoma) cause FLUTD-like signs, most common in older cats
What you'll need
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What the vet will need to know
- Is your cat male or female? Is the male neutered?
- Is any urine being produced? What colour?
- How long has straining been occurring?
- Any blood visible?
- Is the cat eating and drinking normally?
- Any recent changes in the home — new people, pets, building work, change in routine?
- What food does the cat eat? (Wet, dry, or both?) How much water?
- Any previous episodes of FLUTD or bladder problems?
- Any other health conditions?
Aftercare
- Following a urethral blockage, male cats require inpatient treatment including urinary catheterisation under anaesthesia, IV fluids, and monitoring.
- FIC episodes often resolve within 5–7 days even without specific treatment, but management of stress triggers and diet is essential to prevent recurrence.
- Dietary changes: transition to wet food (increased water content reduces urine concentration and crystal formation — one of the most impactful interventions), urinary-specific prescription diets for stone dissolution or prevention.
- Increase water intake: water fountains, multiple fresh water sources, flavoured water, wet food.
- Reduce stress: Feliway Classic diffuser, separate litter trays (one per cat plus one), adequate vertical space, hiding places, stable routines.
- Male cats with repeated blockages may be candidates for perineal urethrostomy (PU) — surgical widening of the urethra.
- Weight management: obese cats are at higher risk of FLUTD.
- Regular follow-up urinalysis and, if stones present, imaging to monitor.
Prevention
- Feed predominantly wet food — the most evidence-based intervention for reducing FLUTD recurrence in FIC cats.
- Provide multiple fresh water sources — water fountains are often preferred by cats.
- Use a urinary prescription diet if recommended by your vet for stone prevention.
- Minimise environmental stress — stable routines, adequate resources for the number of cats, vertical space, hiding places.
- Maintain healthy body weight.
- Provide enough litter trays (one per cat plus one as a rule of thumb) and keep them scrupulously clean.
- Consider environmental enrichment — puzzle feeders, window perches, regular interactive play.
- Use Feliway Classic diffusers during periods of anticipated stress (house moves, new additions to the household).
Breed-specific notes
- Neutered male cats of any breed are at significantly higher risk of urethral obstruction due to their narrow urethra.
- Persians and exotic shorthairs may have urinary tract anatomy predisposing to certain types of FLUTD.
- Overweight domestic shorthairs are at elevated risk for FIC.
- Burmese cats are reported to have higher rates of FIC in some studies.
Frequently asked questions
What is the difference between FLUTD and a blocked bladder?
FLUTD is an umbrella term for any condition causing lower urinary tract signs in cats — straining, blood in urine, frequent visits to the tray. A urethral obstruction (blocked bladder) is the most serious form, where urine cannot exit the bladder at all. In male cats, this is life-threatening and requires emergency vet treatment within hours. Female cats can also obstruct but this is less common due to their wider, shorter urethra.
Why is FIC (Feline Idiopathic Cystitis) linked to stress?
In FIC — the most common form of FLUTD — no infection, stones, or crystals are found. Research has consistently shown that acute stress episodes trigger FIC in susceptible cats, possibly by causing changes in bladder wall integrity and urine composition. Common triggers include changes in routine, new pets or people, environmental disruption, multi-cat tension, and even changes in weather. Addressing the stress component is central to long-term management.
How important is wet food in managing FLUTD?
Very important. Cats evolved from desert ancestors and have a low thirst drive — they obtain most of their water from prey. Dry food alone results in chronic mild dehydration and concentrated urine, which promotes crystal formation and irritates the bladder. Switching to predominantly wet food increases water intake substantially and dilutes the urine — consistently shown in studies to reduce recurrence rates of FIC and struvite crystal formation.
My cat keeps going to the litter tray but producing only a little urine. Is this normal?
No — this is a sign of urinary discomfort and should be assessed by a vet. The key question is whether any urine is being produced. Frequent visits with small amounts of urine passing suggest cystitis or early partial obstruction. Frequent visits with NO urine produced — particularly in a male cat — is a urological emergency and requires immediate vet attention.
Can female cats get blocked?
Yes, although it is much less common than in males. Female cats have a shorter, wider urethra that is less likely to obstruct. However, large bladder stones or urethral tumours can cause obstruction in females. Any female cat that is straining without producing urine for several hours should be assessed by a vet urgently.
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