Feline Lower Urinary Tract Disease (FLUTD)
An umbrella term for conditions affecting the bladder and urethra in cats; feline idiopathic cystitis is the most common cause in cats under 10, and urethral obstruction is a life-threatening emergency.
Overview
FLUTD covers several conditions that produce similar lower urinary signs in cats. In cats under 10, the majority of cases are feline idiopathic cystitis (FIC), where no infection, urolith, or obstructive cause is identified and stress/environmental factors are strongly implicated. Urethral obstruction - most common in male cats due to their narrower urethra - is a distinct, life-threatening emergency that requires immediate treatment.
Clinical signs
- Stranguria (straining to urinate) and pollakiuria (frequent, small urinations)
- Hematuria
- Periuria - urinating outside the litter box
- Excessive licking of the perineal area
- In obstructed cats: vocalizing in distress, a firm and painful bladder, lethargy, and vomiting - this combination is an emergency
Diagnosis
- Physical exam to rule out urethral obstruction first, given how time-critical it is
- Urinalysis, and urine culture to rule out infection (uncommon as a primary cause in younger cats)
- Abdominal radiographs or ultrasound to rule out uroliths or masses
Treatment
- For feline idiopathic cystitis: environmental enrichment and stress reduction, increased water intake (wet food, water fountains), pain control during flare-ups, and sometimes anti-anxiety medication for recurrent cases
- For urethral obstruction: emergency urinary catheterization, IV fluids, and correction of electrolyte abnormalities (especially hyperkalemia), with hospitalization
Prognosis
Feline idiopathic cystitis often has a waxing and waning course, with many cats improving significantly through environmental management. Urethral obstruction is life-threatening without prompt treatment but has a good prognosis when treated as the emergency it is; recurrence risk remains.
This page is general reference information for educational purposes. It is not a substitute for an individual clinical assessment, current formulary guidance, or the judgment of a licensed veterinarian treating a specific patient.
Frequently asked questions
Is FLUTD the same thing as a urinary tract infection?
Usually not. Most young cats with FLUTD have feline idiopathic cystitis, not a bacterial infection - true UTIs are more common in older cats or those with other risk factors. Your vet can confirm with a urine culture.
Why is a blocked bladder especially dangerous in male cats?
Male cats have a narrower urethra than females, making them more prone to a complete blockage from crystals or a mucus plug. A full blockage prevents urination entirely and can become fatal within one to three days without emergency treatment.