What is Feline Idiopathic Cystitis (FIC)?
Written by Dr Madeleine Totham BVetMed(Hons) ABTC-CAB MRCVS, Veterinary Surgeon and Clinical Animal Behaviourist

​If your cat is straining to urinate, visiting the litter tray repeatedly, or urinating outside the litter tray, it can be extremely worrying.  One of the most common causes of these signs is Feline Idiopathic Cystitis (FIC), a painful bladder condition that is strongly influenced by stress and a cat’s environment.  In some cases a cat may not be able to urinate at all which is a true medical emergency.  If you have any concerns about changes to your cat’s urination patterns, or if you aren’t sure if they are able to urinate, please see your vet immediately.  Sometimes a blocked bladder can be mistaken for constipation in a cat too so be aware.

​

In most cases of FIC there is no underlying infection or blockage and a cause for the symptoms is not found.  FIC is strongly linked with stress and how a cat’s environment and emotional state affect the urinary system.  Treating episodes of FIC successfully, and avoiding recurrence, requires a combined veterinary and environmental approach.

​

What is FIC?

FIC is inflammation of the bladder that occurs without an identifiable underlying cause such as infection, bladder stones, or other urinary disease.  It is often described as a diagnosis of exclusion, meaning your vet must first rule out other medical causes.

 

Signs of FIC

Common signs include:

• Cats straining to urinate

• Passing small amounts of urine frequently

• Urinating outside the litter tray

• Blood in the urine

• Crying or vocalising while trying to urinate

• Spending prolonged time in the litter tray

• Visiting the litter tray but nothing comes out (ie no urine is passed)

• A cat with a blocked bladder may also appear lethargic, be off their food and generally unwell

 

Many cats may appear otherwise well between episodes.

​

The role of stress

In many cats, stress plays a major role in triggering episodes of FIC.  Cats living with ongoing stress can develop changes in the body’s normal stress response, which may make the bladder more vulnerable to inflammation.

Common contributing factors include:

• Conflict or tension between cats in the household

• Changes in routine or environment eg work on the house, new family members

• Limited access to safe resting areas

• Competition for resources (including litter trays, food, resting spaces)

• Neighbourhood cats visible through windows or visiting garden

• Unpredictable household routines eg food being given at different times each day

 

Stress does not always look obvious — cats may appear “fine” while still experiencing chronic environmental pressure.

​

FIC is not just a bladder problem

FIC is not only a urinary condition; it is often influenced by the relationship between the nervous system, stress response, and bladder function.  This is why behavioural treatment is also required alongside medical to prevent recurring episodes in some cats.

​

What should I do first?

Any cat showing urinary signs should be assessed by a veterinary surgeon to rule out:

• Urinary tract infection

• Bladder stones

• Urinary obstruction/”blocked bladder” (an emergency – usually only male cats)

• Kidney disease or other medical issues

 

Why recurrence happens

FIC can recur when underlying stress factors in the environment are not addressed.

This may include:

• Ongoing multi-cat tension

• Inadequate litter tray or other resources

• Environmental unpredictability

• Unresolved anxiety or stress triggers

 

How a behavioural and environmental assessment helps with FIC

A full assessment looks at:

• A full medical and behavioural history to establish potential triggers and underlying emotions.

• Household layout and resources

• Litter tray number, placement, and type

• Relationships with other cats and people

• Stress exposure and triggers

• Daily routine and predictability

 

I then create a tailored management plan aimed at reducing stress, improving emotional wellbeing, and lowering the risk of future flare-ups.  This is likely to include some changes to the environment and routine, and medical interventions such as ruling out underlying disease, ensuring the cat is on an appropriate diet, and occasionally behavioural medications.

 

Because urinary signs can indicate serious medical disease, immediate veterinary assessment is required, particularly if a cat is straining without producing urine.

​

About me

As both a qualified Veterinary Surgeon and feline Clinical Animal Behaviourist I understand the close relationship between physical health and emotional wellbeing in cats.  In many cats, recurring FIC reflects a complex interaction between physical health, stress, and the environment, which is why long-term management often needs both veterinary and behavioural intervention.

 

Finally…

If your cat has experienced recurrent urinary episodes, stress-related cystitis, or ongoing litter tray problems, a behavioural consultation can help identify hidden sources of stress and create a practical plan aimed at reducing future episodes.

​

Cats experiencing recurrent FIC often live with underlying environmental stress. You may also find it helpful to read more about stress and anxiety in cats, cats fighting in the home, or urinating outside the litter tray.

​

Contact me here to book an consultation.

​

This page is intended as general guidance only and is not a substitute for veterinary examination, diagnosis, or treatment. If you have concerns about your cat, please speak to your registered vet.

Written July 2026​