Urinary problems in cats: know the warning signs

Feline lower urinary tract disease (FLUTD) encompasses a group of conditions that affect the bladder and urethra, including idiopathic cystitis (inflammation with no identifiable cause), bladder stones, urethral plugs, and urinary tract infections. Stress is considered a significant contributing factor.

Common signs include straining to urinate, frequent attempts with little urine output, blood in the urine, urinating outside the litter box, and vocalizing during urination. FLUTD is more common in overweight, indoor, sedentary cats fed primarily dry diets, though it can affect any cat.

Urethral obstruction occurs when the urethra becomes blocked by mucus plugs, crystals, or stones, preventing urine from leaving the bladder. Male cats are at significantly higher risk because their urethra is longer and narrower than in female cats.

A blocked cat may repeatedly visit the litter box, strain without producing urine, vocalize in pain, and lick the genital area. As toxins build up in the blood, the cat may become lethargic, vomit, and collapse. Without treatment, a urinary blockage can be fatal within 24 to 48 hours. This is always a medical emergency requiring immediate veterinary intervention.

Struvite and calcium oxalate are the most common types of bladder stones in cats. Crystals are microscopic mineral formations that may be found in the urine and can be a precursor to stone formation. Both crystals and stones irritate the bladder lining, causing inflammation, blood in the urine, and discomfort.

Diagnosis is made through urinalysis (which detects crystals), X-rays (which can show stones), and ultrasound. Some struvite stones can be dissolved with prescription diets, while others may require surgical removal. Dietary management is an important part of prevention.

Unlike dogs, urinary tract infections are relatively uncommon in young, healthy cats. However, they become more prevalent in older cats and in cats with underlying conditions such as diabetes, kidney disease, or bladder stones. UTIs may also occur in cats with abnormal urinary tract anatomy.

Signs may include frequent urination, straining, blood in the urine, and urinating outside the litter box. Diagnosis is confirmed through urinalysis and urine culture. Treatment typically involves a course of antibiotics selected based on culture and sensitivity results.

Blood in the urine is a common sign of urinary tract disease in cats and may be caused by inflammation, infection, stones, trauma, or more serious conditions. Sometimes the blood is only visible under a microscope, while other times the urine may appear pink, red, or contain clots.

Even small amounts of blood warrant veterinary attention, as they may indicate an underlying condition that requires treatment. Hematuria in the context of straining and difficulty urinating should be treated as urgent, particularly in male cats where obstruction risk is present.

Stress is recognized as a major contributing factor in feline idiopathic cystitis and lower urinary tract disease. Changes in the household, conflict between pets, outdoor cats threatening from outside windows, and disrupted routines can all contribute to stress-related urinary issues.

Environmental enrichment — including multiple clean litter boxes in quiet locations, vertical space, play enrichment, consistent routines, and reducing inter-cat conflict — is an important component of managing and preventing recurring urinary problems in cats. Your veterinarian can help identify specific stressors and recommend modifications.

Urinalysis is the most important initial test for evaluating urinary problems in cats. It assesses urine concentration, pH, and the presence of blood, crystals, bacteria, and protein. A urine sample is ideally collected as a free-catch or via cystocentesis for the most accurate results.

X-rays and ultrasound help detect bladder stones and assess the size and shape of the bladder and kidneys. Blood work evaluates kidney function and electrolyte levels, which is especially important if obstruction is suspected. Together, these diagnostics help the veterinarian develop an appropriate treatment plan.