Urinary blockage is a painful and life-threatening condition that typically affects male cats. If your male cat has a urinary blockage, it means their urethra — the tube that drains urine from the bladder to the penis and out of the body — is blocked by inflammatory material. When the urethra is blocked and urine can't exit the body, the bladder becomes overfilled or "hyperextended". And if the blockage goes on too long, the kidneys may start to swell and become damaged, leaving the bladder to potentially rupture or tear.

Male cat urinary blockage is extremely common, especially among neutered male cats; therefore, it's critical for pet parents to know the signs of the condition. The sooner a cat receives proper treatment, the more likely they are to have a healthy recovery.

Causes of Male Cat Urinary Blockage

Neutered male cats are especially prone to urinary blockage because they have may narrow urethras — so narrow that involuntary urethral muscle spasms can block the flow of urine. A male cat's urethra can also become blocked by small urinary stones or by urethral plugs: a mixture of bladder-lining cells, mucus, and crystals formed from minerals in the urine. Additional causes of urinary blockage can be feeding foods high in magnesium or the presence of an underlying condition called feline idiopathic cystitis (FIC).

Symptoms of Male Cat Urinary Blockage

The most common sign of what veterinarians call a "blocked cat" is going to the litter box to urinate, getting into position and having nothing come out. Your cat may also seem uncomfortable or yowl when trying to urinate. If the blockage continues, your cat will develop an electrolyte imbalance, which can result in a depressed or altered mental state, vomiting and a slow heart rate. They may also hide or avoid human contact.

The veterinarian will diagnose your cat based on their medical history, a physical examination, blood and urine tests and, possibly, an abdominal X-ray or ultrasound. If they suspect that your cat has a bladder infection, the vet may submit a urine sample for culture.

Treating Urinary Blockage

If your cat has urinary blockage, they should be hospitalized immediately for emergency treatment. The veterinary staff may place an intravenous catheter to deliver fluids and medicine to your cat. Your cat will then be sedated and a urinary catheter will be placed to relieve the obstruction and empty their bladder. The catheter is then left in place for several days to let the urethra heal and let your cat recover. Most blocked cats are hospitalized for several days.

Once your cat is urinating normally, you'll be able to bring them home. The vet will likely prescribe them antibiotics, pain medicine and/or medicine to relax the urethra, as well as recommend a therapeutic food formulated for urinary health.

Preventing Male Cat Urinary Blockage

Unfortunately, once a male cat has a urinary blockage, there's a higher risk of it happening again. At the first sign of urinary issues, you should have a conversation with your vet about selecting proper nutrition to better support your cat's urinary health to reduce the risk of recurring issues. In highly recurrent cases it's also possible for your vet to suggest a cat urethrostomy — a surgery that creates an opening in the urethra above the blockage to allow for normal urine drainage.

Water consumption is an important part of flushing debris from your cat's system and preventing blockage; to increase water consumption, ask your vet about offering them water from a drinking fountain instead of a bowl, flavoring a second water bowl with some tuna juice and switching them to canned food if they currently eat dry food.

Nutrition can also play an important role in preventing blockage. If your cat already experiences urinary health issues, your veterinarian may recommend a therapeutic cat food to help dissolve crystals, make it less likely they form new ones, and maintain a healthy urine pH that contributes to overall urinary health. This food is only available through your veterinarian and should be fed under the supervision of a vet; ask your vet if a Prescription Diet cat food might be right for your cat..

The Role of Stress

Another major factor in feline lower urinary tract disease (FLUTD) related conditions is stress, so it is important to consider your cat's stress level when evaluating urinary issues. Cats are susceptible to stress-related lower urinary disorders, including cystitis and urethral spasms, which can result in blockage. Reducing a cat's stress may lower their chance of lower urinary tract diseases, including urethral blockage.

Your cat could be stressed if:

  • They're bored
  • The household has too many cats and they have to compete for resources (i.e., alone time at the litter box or competing for food and water)
  • Other cats bully them
  • Their litter box is dirty

Sometimes, having out-of-town visitors, moving furniture or renovating can stress a cat out as well. If your cat is having issues with urinary blockage, consider whether there's anything that could be causing them stress, then try to eliminate those stressors. Here are a few tips on how to eliminate stress for your cat:

  • Provide your cat with plenty of toys to engage them.
  • Make sure to keep at least one more litter box in the home than you have cats, so they can have some privacy to do their business. Make sure to separate these litter boxes throughout the house. Also, be sure to clean the litter boxes daily.
  • Also, make sure to have one bowl per cat. Think about it: do you want to share a plate with someone else?
  • Provide your cat with a cat perch or condo. Cats love to be up high where they can see things and it gives them the privacy they want.
  • Finally, talk to your vet about certain therapeutic diets that are formulated to manage stress response in cats.

Although urethral blockage is common among neutered male cats, it doesn't have to be a problem for your kitty. Have a conversation with your vet to determine the best line of treatment for your cat.

Frequently Asked Questions

A urinary blockage is a life-threatening emergency — especially in male cats. Get into your vet or emergency animal hospital immediately if you see these signs in a female or male cat:

  • Straining in the litter box with little or no urine output.

  • Crying or vocalizing while trying to urinate.

  • Frequent trips to the litter box without producing urine.

  • Licking the genital area excessively.

  • Vomiting, blood in urine, low energy (lethargy), loss of appetite.

Yes, a cat can have a partial urinary blockage and still pass small amounts of urine, and they need to be seen by a veterinarian urgently. Your cat needs immediate veterinary attention if you see these signs:

  • Small amounts of urine each time.

  • Straining or discomfort during urination.

  • Blood-tinged urine.

  • More frequent litter box visits than normal.

  • Urinating outside the box.

A partial blockage can quickly progress to a complete blockage. Don't wait — see a vet promptly.

Never attempt to clear a urinary blockage at home — this requires immediate veterinary care. If your veterinarian determines your cat is blocked, they may recommend some of the following:

  • Sedation or anesthesia for the cat's comfort.

  • Urinary catheterization to relieve the blockage and drain the bladder.

  • IV fluid therapy to flush toxins and rehydrate.

  • Bloodwork monitoring to check kidney function and electrolyte levels.

  • Hospitalization — your veterinarian will determine length of stay.

If you suspect your cat has a urinary blockage, get to a veterinarian or an emergency animal hospital immediately. Yes, most cats can survive a urinary blockage with veterinary treatment as soon as signs are noticed.

Without treatment, a complete blockage can become fatal due to:

  • Bladder rupture.

  • Kidney failure.

  • Toxic potassium buildup, which can cause cardiac arrest.

Your veterinarian may recommend these to help reduce the risk of recurrence:

  • A veterinary therapeutic urinary food.

  • Increased water intake.

  • Medications as needed.

No. Never attempt to unblock a cat's urethra at home — this is a medical emergency that requires immediate veterinary care. Urinary blockage in cats requires:

  • Professional sedation and catheterization.

  • Blood tests to assess kidney damage and potassium levels (dangerously high potassium can cause cardiac arrest).

  • IV fluid support and hospitalization for recovery.

Attempting home treatment can cause bladder rupture, extreme pain, or death. If your cat cannot urinate, seek veterinary care immediately.

Dr. Sarah Wooten Dr. Sarah Wooten

Dr. Sarah Wooten graduated from UC Davis School of Veterinary Medicine in 2002. A member of the American Society of Veterinary Journalists, Dr. Wooten divides her professional time between small animal practice in Greeley, Colorado, public speaking on associate issues, leadership, and client communication, and writing. She enjoys camping with her family, skiing, SCUBA, and participating in triathlons.