Symptoms2026-03-09Carelogy編集部
FLUTD in Cats: Blood in Urine, Frequent Urination & Urinary Blockage
Feline Lower Urinary Tract Disease (FLUTD): causes of blood in urine, frequent urination, and urinary blockage in cats. Vet-supervised guide.
The Bottom Line: Urinary Blockage in Male Cats Is a Life-Threatening Emergency
If your cat is straining in the litter box but producing no urine, get to a vet immediately. Urinary blockage in male cats is especially dangerous — left untreated, it can cause acute kidney failure and death within 24 to 48 hours.
On the other hand, if your cat has blood-tinged urine but is otherwise eating, drinking, and acting normally, a next-day appointment is usually safe. FLUTD is an extremely common group of conditions, estimated to affect 10–15% of all cats at some point in their lives.
Key Symptoms of FLUTD
Watch for these telltale signs:
- Frequent trips to the litter box with little or no urine produced
- Blood in the urine (pink to red discoloration)
- Crying or vocalizing while urinating — a clear pain signal
- Urinating outside the litter box — the cat associates the box with pain
- Excessive licking of the genital area
- [Not urinating at all](/en/columns/cat-not-urinating) — possible urinary blockage
The combination of straining with no urine output + lethargy + vomiting is the classic triad of a urinary blockage and demands emergency veterinary care.
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What Causes FLUTD
Feline Idiopathic Cystitis (FIC): The leading cause, responsible for about 60% of FLUTD cases. Stress plays a major role. The bladder becomes inflamed despite no identifiable infection or stones.
Urinary stones (urolithiasis): Struvite (magnesium ammonium phosphate) and calcium oxalate are the two most common types. Diet pH and mineral balance are significant contributing factors.
Urethral plugs: A mixture of crystals, proteins, and cellular debris that lodges in the narrow urethra of male cats, causing a blockage.
Bacterial infection: Relatively uncommon in younger cats but becomes more likely in seniors and cats with pre-existing kidney disease.
Treatment and Preventing Recurrence
Acute treatment:
- For urinary blockage: urethral catheterization (typically 1–3 days of hospitalization)
- Pain relief and anti-inflammatory medication
- IV fluids to correct dehydration and electrolyte imbalances
Recurrence prevention (the most critical part):
- Increase water intake: Prioritize wet food, provide multiple water stations, and use a pet water fountain
- Urinary care diet: Formulated to manage urine pH and mineral balance
- Reduce stress: Add more litter boxes (one per cat plus one), and review indoor safety for environmental improvements
- Weight management: Addressing obesity is equally important
FLUTD has a high recurrence rate — about 50% of cats relapse within a year — so ongoing preventive management is essential.
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FLUTD血尿膀胱炎尿路結石頻尿猫の病気
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