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

Why Is My Cat So Affectionate All of a Sudden? 4 Vet-Reviewed Reasons

We can all agree that receiving affection from our cats is rarely a bad thing. However, if your cat is suddenly affectionate, you...

Why Does My Cat Sleep Next to Me? 5 Vet-Reviewed Reasons for This Behavior

Cats are interesting animals. They are quite independent, yet they insist on regular attention from their human family members. They sleep frequently, but...

Will My Cat Eat My Guinea Pig? Risks, Safety Tips & FAQ (Vet-Verified)

If you’re a cat person who is interested in becoming a guinea pig person or vice versa, you may be wondering if it’s...

10 Best Cat Feather Wand Toys in 2025 – Reviews & Top Picks

Out of all the cat toys, feather wands are probably among the most entertaining! Cats love feathers, and there is hardly anything more...

More related

Pet Remembrance Day 2025: How & When to Celebrate

Worldwide, there are over a billion pets, and while this is a whole lot of love and companionship, it also leads to a...

Top 14 Cat Breeds that Get Along with Other Cats (With Info & Pictures)

Many felines get along with their favorite humans, but not all of them play nice with other household pets, especially other cats. However,...

9 Best Stainless Steel Cat Bowls in 2025 – Reviews & Top Picks

Stainless steel products are a no-brainer in a house full of animals. This material doesn’t stain or scratch. Better yet, it’s naturally resistant...

Is Febreze Safe for Cats? Precautions & Alternatives

When we share our home with kitties, finding compatible cleaning products can be a bit of a challenge. If you have a purring...

Keep reading

10 Vet-Reviewed Facts About Cats’ Teeth: Feline Anatomy Explained

Your cat’s teeth are important tools that they need for eating and fighting, but they are also quite small and surprisingly delicate, and many felines suffer from dental disease later in life. If you are looking to learn all that...

close up of cat's teeth

Can Cats Eat Kiwi? Vet-Verified Facts & FAQ

Kiwi is a delicious summer fruit to enjoy in a fruit salad, smoothie, or simply on its own; plus, it has a host of nutritional benefits! In fact, it is packed with beneficial vitamins, minerals, and nutrients. You may be...

Can Cats Eat Kiwi

Should I Get a Kitten for My Cat? Vet-Approved Introduction Tips & FAQ

Introducing pets is an equally exciting and scary prospect for devout cat owners. Will they love one another and enrich each other’s lives in your absence? Or will they jockey for power and aggressively protect their territory, making life a...

cat-smelling-kitten

Applaws Cat Food Review in 2025: Recalls, Pros, & Cons

Review Summary Applaws pet food is one of the many brands that you can choose from in your search for the perfect mix of deliciousness and nutrition. Predominantly, Applaws makes wet cat food with some dry food. Most cat owners...

Applaws Cat Food Review

5 Vet-Reviewed Reasons Why Your Cat Won’t Leave You Alone

Cats are unusual animals with some strange behaviors at times, but cat owners have learned their strange rituals and gotten to know some of the reasons behind specific behavior. Every pet parent adores cuddling and spending every minute of their...

ginger-cat-on-a-shoulder-of-its-owner

Why Do Cats Like Sitting on Laps? 5 Vet-Verified Reasons

Cats generally love to curl up and sit on laps, and it’s a favorite feline activity. If you have a lap cat at home, you may wonder why your buddy loves sitting on your lap so much. Cats sit on...

Domestic cat lying on owner's lap

What Can Cats Drink Besides Water? 3 Vet-Approved Options

Did you know your cat probably doesn’t drink enough water? Urinary problems are the reason behind many vet visits, whether it’s treatment for bladder stones, cysts, or other problems falling under Urinary Tract Disease. Urinary problems are actually the leading...

What Can Cats Drink Besides Water

Are All White Cats With Blue Eyes Deaf? Vet-Reviewed Facts & FAQ

At some point, you’ve likely heard someone say that all white cats are deaf—particularly those with blue eyes. But is this factual? Not entirely! While white cats with blue eyes certainly are more prone to hereditary deafness—white cats, in general,...

turkish cat with blue eyes_love pattern_shutterstock