Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

What’s the Difference Between FLUTD & FIC? Signs, Diagnosis & Treatment (Vet Answer)

veterinarian examining a bengal cat at the clinic

Cats can experience all sorts of issues when it comes to their urination and litter box habits, and it can be frustrating to know that your cat is experiencing health issues. Two terms commonly used when describing urinary concerns with cats are feline lower urinary tract disease (FLUTD) and feline idiopathic cystitis (FIC). This article will dive into these two terms and what they mean to your feline companion. Let’s get into the details!

  • FLUTD: Broad term for different diseases that impact the lower urinary tract. Can be one of many issues.
  • FIC: A specific disorder that falls under FLUTD. Inflammation of the bladder.

divider cat paws 2 oct 2024

Overview of FLUTD

Feline lower urinary tract disease is a broad term that encompasses numerous diseases that impact the lower urinary tract, all of which cause similar signs. The lower urinary tract refers to the urinary bladder and the urethra. Examples of diseases or illnesses that can be considered FLUTD include urinary tract infections, bladder stones, neoplasia, and idiopathic cystitis (FIC), among others.

sphynx cat using purple cat litter box
Image Credit: Kokorina Mariia, Shutterstock

Clinical Signs of FLUTD

  • Straining to urinate
  • Blood in urine
  • Inappropriate elimination
  • Pain
  • Decreased urine voiding or blockage
  • Excessive grooming of urinary opening

If you are concerned about the health and well-being of your pet, we recommend getting in touch with a vet for guidance.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money

divider cat paws 2 oct 2024

Diagnosing FLUTD

Diagnosing a specific cause of FLUTD is imperative, as this determines treatment plans. The first step in diagnosing FLUTD in a cat with urinary signs is a physical examination by your veterinarian. Your veterinarian will thoroughly look your pet over, and the bladder will be palpated gently to check for tautness.

Following a physical examination and review of patient history, your veterinarian will want to evaluate a urine sample. The urine sample may be obtained through a cystocentesis or natural voiding. Cystocentesis is a procedure that allows urine to be pulled directly from the bladder using a needle and syringe, often guided by an ultrasound. A urine sample obtained through cystocentesis helps avoid contamination of urine.

Urinalysis

A urinalysis will help identify signs of infection, including bacteria, blood, and white blood cells. In the absence of cells suggestive of an infection, cystitis may be suspected.

Bladder Ultrasound

An ultrasound of the bladder is a helpful modality, as it allows a doctor the opportunity to evaluate the health of the bladder wall. This diagnostic can often identify bladder stones, clots, and even tumors.

female vet doing ultrasound on a cat
Image Credit: Libre, Shutterstock

Radiographs

If bladder stones are suspected, a radiograph may be done to identify how many stones are present and if they extend into the urethra.

divider cat paws 2 oct 2024

Treating FLUTD

Treatment of FLUTD will be dependent on the underlying cause. Treatment can range from a course of antibiotics for an infection to surgery in the event of bladder stones. If a blockage is present, the patient will require hospitalization and a urinary catheter for several days. Supportive care is often also initiated, which often includes fluid therapy and pain medication. In some situations, depending on the underlying cause of FLUTD, a dietary change may be recommended.

divider cat paws 2 oct 2024

Overview of Idiopathic Cystitis

FIC is a specific example of FLUTD. FIC causes inflammation of the bladder despite the lack of an infection. It is estimated that two-thirds of patients with FLUTD have FIC. In FIC, the underlying cause of inflammation of the bladder is not identifiable. In suspected FIC patients, stress has often led to FLUTD signs.

Diagnosing FIC

Cats suffering from FIC will exhibit the clinical signs outlined above. Diagnosing FIC will often involve using the modalities listed above. However, affected cats will not have an identifiable cause of bladder inflammation like a stone or infection. Again, stress is thought to play a role in the development of FIC.

The history of cats with clinical signs of FLUTD will be very valuable, as cats with FIC typically have experienced stress. Examples of changes that may have stimulated stress include changes to the household dynamic, travel, boarding, a dietary change, new litter boxes or litter, etc.

Cat sitting on a vet metal table
Image Credit: Tyler Olson, Shutterstock

Treatment of FIC

There are several different interventions that can be done that prove beneficial to cats with feline idiopathic cystitis. Cats battling FIC are often uncomfortable, and as a result, pain medication is often administered. Historically, anti-inflammatories and opioids have been used to provide relief. Additionally, fluid therapy to help dilute the concentration of urine is helpful. Medications and pheromones used to reduce stress can be beneficial as well.

Environmental enrichment should be used to reduce stress and facilitate exercise. Examples of beneficial enrichment involve food puzzles, cat trees, and toys.

Additionally, cats diagnosed with FIC may have preferences for litter boxes. Having different options available for the cat to choose from can be helpful. Additionally, the litter box should be routinely cleaned, as some cats will not use a litter box if it is dirty, which can lead to stress and inappropriate elimination.

In cats experiencing reoccurrence of FIC or that are prone to the development of FLUTD, dietary changes may be recommended.

divider cat paws 2 oct 2024

Conclusion

FLUTD is a broad term for different diseases that impact the lower urinary tract, while FIC is a specific disorder that falls under FLUTD. The exact cause of FLUTD signs is unknown in patients diagnosed with FIC; however, stress seems to play a role. There are several interventions that cat owners can do to help support a healthy urinary tract and minimize FLUTD occurrences, but you should always see a vet if your cat is having urination issues and follow their advice.


Featured Image Credit: Pressmaster, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

8 Best Cat Scratching Posts in the UK in 2026 – Reviews & Top Picks

Cats love to scratch and, as well as being a means of maintaining and sharpening their claws, it offers a way to mark...

Ocicat Cat Breed: Info, Pictures, Temperament & Traits

The Ocicat is a medium-sized purebred recognized by the Cat Fanciers Association (CFA) and The International Cat Association. The exotic-looking cats are not...

Dwelf Cat: Info, Pictures, Temperament & Traits

Although a relatively new breed, the Dwelf cat is becoming more popular. Although these cats can be social, friendly, affectionate, intelligent, and active,...

6 Best Automatic Wet Cat Food Feeders in 2026 – Reviews & Top Picks

Sometimes, remembering to feed your cat on a strict schedule can be hard to maintain—even though they probably don’t let you forget. To...

More related

Why Do Cats Have Black Lips? How This Trait Evolved

Cats are fascinating animals, not only because of their silly antics but also how close they are to their wild counterparts. Domestication has...

Egyptian Mau Siamese Mix: Info, Pictures, Traits & Facts

You might have already guessed it, but the Egyptian Mau Siamese mix is a cross of the Egyptian Mau and Siamese cats. These...

How Far Can a Male Cat Smell a Female Cat in Heat? Vet-Approved Facts & FAQs

If you’ve noticed your male cat being more than eager to get outside lately, yowling at the door, and being quite the nuisance,...

6 Vet-Verified Ways My Cats Tell Me It’s Mealtime

There are fewer things more persistent than a hungry cat! Even the most introverted feline has no issue alerting their owners to mealtime...

Keep reading

How Many Muscles Does a Cat Have in Each Ear? Vet-Reviewed Anatomy (With Infographic)

When it comes to dogs, we all know how good their senses are, especially for smelling and hearing. But in this regard, cats are similar to their canine counterparts and even have a few epic secrets of their own. A...

A man's hand scratches a fluffy cat behind the ear

6 Best Cat Cleaning Wipes in 2026 – Reviews & Top Picks

It’s no secret that our felines can get messy occasionally. Whether rubbing their leftover bathroom particles across your carpet or running through the house with muddy paws, wipes can be handy for cleaning up after our frisky kitties. If you...

hand wiping an orange cat with pet wipes

9 Best Dematting Tools for Cats in 2026 – Reviews & Top Picks

Keeping your feline healthy and happy is your top priority, but are you brushing your cat’s hair every week? Cat owners often disregard grooming duties because cats seem to take care of themselves pretty well. Cats are methodical about cleaning...

hand holding shedded cat hair

Why Is My Cat Suddenly Aggressive? Vet-Reviewed Reasons

It can be extremely disconcerting for your cat to suddenly begin to exhibit behavior that is unusual for them, especially if your once sweet kitty has suddenly become an aggressive monster. There are a few reasons that cats may suddenly...

kittens training

Can Cats Eat Bagels? Vet-Approved Facts & FAQ

Bagels are delicious breakfast staples enjoyed by people around the world. To create this wondrous deliciousness, bakers make dough, let it rise, and then shape it into bagels. The rounds are then boiled and baked. But can cats eat bagels?...

Can Cats Eat Bagels

Can Cats Drink Vegetable Oil? Vet-Approved Diet Facts & FAQ

Cats are curious creatures that like to put their noses, mouths, and paws everywhere. Moreover, cat parents who cook a lot know how difficult it is to keep their feline’s inquisitive nose out of their kitchen! But if your cat...

Can Cats Drink Vegetable Oil

Can Cats Eat Ketchup? Vet-Reviewed Diet Facts & FAQ

When considering what kind of human foods are okay to give to our cats, we’re usually thinking in terms of actual food and not condiments, such as mayonnaise or ketchup. However, there’s always a chance our feline friends could manage...

Can Cats Eat Ketchup

Can Cats See Fire? Explaining Feline Vision & FAQ

Cats have long fascinated humans with their enigmatic behaviors and extraordinary senses. We are often told that cats have superior senses compared to us, enabling them to perceive the world in a unique way. One intriguing question that often arises...

Glass Fireplace