Overactive Bladder, Bladder Pain Syndrome & Interstitial Cystitis: What's the Difference?

Overactive Bladder (OAB), Bladder Pain Syndrome (BPS) and Interstitial Cystitis (IC) can all involve urinary urgency and frequency, but they aren't the same condition.

One of the most useful things to understand is why someone feels the need to empty their bladder.

With Overactive Bladder, urgency is the key symptom, with frequency often developing alongside it. Some people experience urgency-related leakage and may begin emptying their bladder frequently because they're worried they won't make it to the toilet in time.

With Bladder Pain Syndrome, the urge to empty may instead be associated with bladder pain, pressure or discomfort, which often becomes more noticeable as the bladder fills.

Interstitial Cystitis is a more specific bladder condition in which characteristic Hunner lesions are identified during cystoscopy.

Understanding these differences can help guide appropriate assessment and management.

Overactive Bladder is characterised by a sudden, compelling urge to urinate that can be difficult to defer. It usually occurs alongside increased daytime frequency and/or waking during the night to urinate and can occur with or without urinary leakage.

You may notice:

• Sudden urinary urgency

• Frequent trips to the toilet

• Difficulty delaying urination

• Waking during the night to urinate

• Leakage before reaching the toilet

• Going to the toilet “just in case”

• Planning your day around toilet access

• Feeling worried about whether you'll make it to the toilet

Importantly, OAB doesn't necessarily mean your bladder muscle is physically overactive. OAB is diagnosed from the pattern of symptoms, while detrusor overactivity is a separate finding identified during urodynamic testing.

What Is Overactive Bladder (OAB)?

Why Am I Going to the Toilet So Often With OAB?

This is where I think your clinical explanation is really valuable.

Someone experiencing strong urgency — particularly if they've leaked before or are worried they might leak — may begin emptying their bladder more frequently to avoid experiencing that situation.

You might find yourself thinking:

“I'll go before I leave, just in case.”

“There's a toilet here, so I should probably use it.”

“I don't want to risk getting caught somewhere without a bathroom.”

Over time, these habits can contribute to a pattern of frequent toileting and smaller bladder volumes.

This is why looking at urgency, frequency, bladder volumes, leakage and toileting behaviours together can be useful.

Bladder Pain Syndrome is different.

BPS involves persistent or recurrent pain, pressure or discomfort perceived to be related to the bladder, together with another urinary symptom such as urgency or frequency.

A common feature is that discomfort becomes more noticeable as the bladder fills.

Someone may therefore empty their bladder frequently not because they're worried about leaking, but because:

“If I don't go, my bladder is going to hurt.”

Urination may temporarily reduce the discomfort.

Symptoms may include:

• Bladder pain

• Pelvic pressure or heaviness

• Pain as the bladder fills

• Frequent urination

• Urgency driven by discomfort

• Temporary relief after urinating

• Urethral discomfort

• Pelvic pain

• Pain during or after sex

• Symptoms that flare and settle

What Is Bladder Pain Syndrome (BPS)?

This is an important distinction from OAB.

Imagine someone knows that once their bladder reaches a certain level of fullness, they begin experiencing significant pain.

They may start urinating before their bladder reaches that point.

So their frequency may become a strategy for avoiding pain:

Bladder fills → discomfort increases → person urinates → discomfort reduces → person learns to empty earlier.

That pattern can look very similar to OAB when you only look at the number of toilet trips.

The reason behind the urge helps tell us much more.

Why Am I Going to the Toilet So Often With BPS?

What Is Interstitial Cystitis (IC)?

Bladder Pain Syndrome describes the symptom syndrome of bladder-related pain, pressure or discomfort alongside urinary symptoms when another identifiable cause doesn't adequately explain them.

Interstitial Cystitis with Hunner lesions describes a more specific presentation where characteristic Hunner lesions are identified within the bladder during cystoscopy.

Hunner lesions are not found in everyone with bladder pain syndrome.

You'll often see the terms combined as Interstitial Cystitis/Bladder Pain Syndrome (IC/BPS), particularly in medical literature.

However, some classification systems distinguish between:

Bladder Pain Syndrome
Bladder-related pain, pressure or discomfort accompanied by urinary symptoms without another identifiable explanation.

and

Interstitial Cystitis with Hunner lesions
Similar bladder symptoms with characteristic Hunner lesions identified on cystoscopy.

So someone can experience BPS symptoms without having Hunner lesions.

Are BPS and Interstitial Cystitis the Same Thing?

Hunner lesions are areas of inflammation and damage within the lining of the bladder that are found in a subset of people with Interstitial Cystitis.
They are identified during a cystoscopy, where a specialist looks directly inside the bladder. They aren't simply bladder “ulcers”, although they have historically been called Hunner ulcers.

What Symptoms Can Hunner Lesions Cause?

Hunner lesions are associated with a more clearly identifiable inflammatory bladder presentation and may contribute to:

• Bladder pain, pressure or discomfort, particularly as the bladder fills

• Urinary frequency, as someone may empty their bladder more often to avoid increasing pain

• Urinary urgency

• Waking frequently overnight to urinate (nocturia)

• Reduced comfortable bladder capacity

• Pelvic or urethral discomfort

• Symptoms that can significantly affect sleep and everyday activities

What Are Hunner Lesions?

OAB vs BPS vs IC: What's the Difference?

OAB can occur with or without urgency urinary incontinence.

Some people experience intense urgency and frequent urination but never actually leak.

This is sometimes informally described as “OAB dry”, whereas urgency accompanied by urinary leakage has historically been called “OAB wet.”

So the absence of leakage doesn't necessarily rule out OAB.

Can You Have OAB Without Leakage?

Can Pelvic Floor Tension Occur With OAB, BPS or IC?

Yes, pelvic floor dysfunction can occur alongside bladder symptoms.

For some people, pelvic floor muscles may be overactive, sensitive or have difficulty relaxing appropriately.

This can be particularly relevant when someone has been experiencing persistent urgency or pelvic/bladder pain.

But we shouldn't automatically assume:

bladder urgency = weak pelvic floor

or

bladder pain = tight pelvic floor.

The pelvic floor may be one contributing factor, and assessment helps determine whether it is relevant for that individual.

The story behind the symptoms matters.

Questions we might consider include:

• What actually makes you decide to go to the toilet?

• Are you worried you'll leak?

• Are you trying to avoid pain?

• Does your bladder become painful as it fills?

• Does urinating relieve your symptoms?

• How often are you urinating?

• What volumes are you passing?

• Do you experience urgency?

• Do you leak with urgency?

• Are you waking overnight to urinate?

• Have infections been appropriately excluded?

• Have you had previous urology investigations?

A bladder diary can be particularly useful because it allows us to look at frequency, fluid intake, bladder volumes, urgency and leakage rather than relying on frequency alone.

How Do You Work Out Which Bladder Problem You Have?

Once we understand why you're going frequently and what your bladder symptoms actually look like, management can be much more individualised.

Depending on your presentation, pelvic health care may involve:

• Bladder diary assessment

• Bladder retraining where appropriate

• Urge-management strategies

• Pelvic floor assessment

• Pelvic floor relaxation or rehabilitation

• Education around bladder filling and normal bladder sensations

• Reviewing “just in case” toileting

• Breathing and nervous-system strategies

• Pain education

• Fluid and bladder-habit education

• Referral or collaboration with your GP, urologist or urogynaecologist

And importantly, someone with OAB may need a very different approach from someone whose frequency is being driven by bladder pain.

How Can Pelvic Health Care Help?

At Yarra Valley Women's Health, our pelvic health osteopaths assess bladder concerns including overactive bladder, urinary urgency and frequency, bladder pain and associated pelvic floor dysfunction.

Understanding why you're going to the toilet frequently — rather than looking at frequency alone — can help guide an individualised management plan and determine when collaboration with your GP or specialist is appropriate.

Bladder & Pelvic Health Care in Healesville