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Pancaking: why output sticks at the top of the bag | CION Cancer Clinics
Pancaking is when stoma output stays around the stoma at the top of the bag instead of dropping down. It happens when the sides of the bag stick together from too little air, and when output is thick. It pushes under the seal and causes leaks. Adding a little air, covering the filter and using a lubricating gel usually help. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- What is pancaking, and why does it happen?
- Why does output stay stuck at the top?
- What stops pancaking?
- Is it pancaking, ballooning or an ordinary leak?
- What do people believe about pancaking, and what is true?
- Who do these fixes not suit?
- What should you keep ready if pancaking is a problem?
- Common questions about pancaking
The short answer
What is pancaking, and why does it happen?
Pancaking is when output stays at the top of the bag, around the stoma, instead of dropping to the bottom. It happens when the sides of the bag stick together, usually because there is too little air inside, and when the output is thick enough to sit where it lands.
Why it causes trouble
Output that stays on top of the stoma gets pushed under the baseplate. That lifts the seal from the inside, so the leak starts from the top edge and often goes unnoticed until the skin is sore. It can also cover the stoma itself and make it hard for more output to come out.
Who gets it most
Pancaking is much more common with a colostomy, where output is thicker. It can also happen with an ileostomy when output thickens, or in someone who is eating and drinking very little. It is often worse at night, when you lie still and tight bedding presses the bag flat.
It is a fitting problem, not a disease
Pancaking does not mean the stoma is unhealthy. It is about the bag, the output and a few daily habits. Most people find a mix of small changes that stops it. It can take some trial and error, so change one thing at a time and give each change a few bag changes before you judge it.
How to spot it early
Look at the bag when you empty it. If output is gathered in a ring near the top and the lower half is flat and empty, that is pancaking. At a change, a brown line creeping under the top edge of the baseplate is another early sign. Catching it at this stage saves the skin from getting sore.
What sets it off
Why does output stay stuck at the top?
Usually two or three of these are happening together.
A vacuum in the bag
A filter that works very well lets all the air out. The two sides of the bag then cling to each other, and output has no space to fall into.
Thick or dry output
Firm, sticky output does not slide. Not drinking enough, a diet very low in fibre, and some pain medicines can all make output thicker.
Common after surgery
- Strong pain medicines
- Eating and drinking less than usual
Pressure on the bag
Tight waistbands, a firmly tucked saree or a snug belt press the bag against the stoma. So does sleeping on your front.
Sitting still for long
Long hours at a desk, in a car or in bed give output no movement to help it drop down the bag.
Not sure whether this applies to you?
Ask an oncologistSmall changes
What stops pancaking?
Put a little air in first
Before fitting a new bag, pull the sides apart or blow a little air into it. This stops the sides clinging from the start.
Cover the filter
Many people put a filter cover sticker on for a while, so that some air stays inside. Remove it if the bag starts to balloon.
Use a lubricating gel
A lubricating deodorant squeezed inside the bag helps output slide down. Ordinary oils damage the adhesive, so use one made for stoma bags.
Keep the bag free
Wear the waistband above or below the stoma, not on it. Loose cotton at night helps more than tight bedding.
Side by side
Is it pancaking, ballooning or an ordinary leak?
What you see
What it usually is
A flat bag with output sitting over the stoma
Pancaking, from too little air inside
A bag swollen like a balloon
Ballooning, from too much gas
Output tracks under the top edge of the seal
Often pancaking pushing under the baseplate
Output tracks towards a skin fold at the side
An ordinary leak from a crease or dip
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Commonly believed
What do people believe about pancaking, and what is true?
"Pinch the filter off completely and it will stop."
Blocking or cutting away the filter usually swaps pancaking for ballooning and smell. A removable cover lets you control how much air stays in.
"Put coconut oil inside the bag to make it slide."
Oil spreads to the adhesive and loosens the seal. Use a lubricating gel made for stoma bags, which is designed to stay in the bag.
"Take a laxative from the chemist to soften it."
A laxative is a medicine, and with a stoma the wrong one can cause watery output or dehydration. Ask your doctor before taking any, including herbal powders.
"It means the stoma is too small."
Pancaking is about air, output and pressure on the bag. A stoma that seems to narrow, or output that only comes out with straining, is a separate problem for your surgical team to check.
Being straight with you
Who do these fixes not suit?
The usual advice for thick output is to drink more and eat a little more fibre. That advice is not safe for everyone, and it is the part people most often follow without checking.
If you have been told to limit fluids
People with some heart or kidney conditions are told to keep fluids within a set amount. If that is you, do not drink more on your own to soften output. Ask the doctor who set the limit what is safe.
If you have an ileostomy
Adding fibre can raise the chance of a blockage with an ileostomy. Your team may prefer other changes. The same goes for anyone who has had a blockage before.
What this page cannot tell you
It cannot tell you why your output has become thick. Pain medicines, iron tablets and changes in eating after surgery can all play a part, and only your doctor can decide whether any medicine should change. Never stop a prescribed medicine yourself to fix pancaking.
If pancaking keeps causing leaks despite these changes, ask a stoma nurse to review the bag type and the filter.Worth keeping at home
What should you keep ready if pancaking is a problem?
- Filter cover stickers from your bag supplier
- A lubricating deodorant made for stoma bags
- Soft, loose cotton clothes for night
- A water bottle you can see, if fluids are allowed
- Adhesive remover and soft gauze for quick changes
- A note of which fixes you have already tried
Questions we are asked
Common questions about pancaking
Why is pancaking worse at night?
When you lie still, output does not move down the bag, and bedding or a tight nightdress presses the bag flat against the stoma. Blowing a little air into the bag before bed, covering the filter and wearing something loose often help. Some people also sleep slightly on their side.
Is it safe to put tissue inside the bag?
Some stoma nurses suggest a small, loosely folded tissue inside the bag to keep its sides apart. It should never touch or cover the stoma. Ask your own stoma nurse before trying it, because it does not suit every bag or every kind of output.
Does pancaking happen with an ileostomy?
Less often, because ileostomy output is usually loose. It can happen when output thickens, for example when you eat more starchy food or take medicines that slow the gut. The usual advice about fibre may be different with an ileostomy, so check with your team before changing your diet.
Can pancaking damage the stoma?
It does not usually harm the stoma itself. The problem is the skin, because output forced under the baseplate makes the skin sore. If the stoma looks swollen, changes colour or stops passing output, contact your surgical team rather than treating it as pancaking.
Should I switch to a bag without a filter?
It is one option, and some people use a bag without a filter at night only. Without a filter, gas stays in the bag, so ballooning may follow. A filter cover gives you more control. A stoma nurse can suggest which suits your pattern of output and gas.
What can I eat to make output softer?
With a colostomy, regular meals with cooked vegetables, fruit and enough fluid often help. With an ileostomy, or after a blockage, the advice may differ. If you have a fluid limit or diabetes, check any change first. Your team or a dietitian can give you a plan that fits.
My mother cannot tell us when it happens. How do we check?
Look at the bag at set times, such as after meals and before bed. A flat bag with output collected near the top is the sign. Check the top edge of the baseplate for lifting. Keep a simple note, because it helps the stoma nurse see the pattern.
When is this more than pancaking?
If there is no output at all for longer than is usual for you, with cramping pain, a swollen tummy or vomiting, it may be a blockage. A stoma that turns dark also needs urgent care. In both cases go to an emergency department the same day.
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Sources
- NHS — Colostomy
- NHS — Ileostomy
- American Cancer Society — Ostomies
- Macmillan Cancer Support — Cancer information and support
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Stoma Bag Leaks: Causes and FixesOther reasons a bag lifts and leaksGas and BallooningThe opposite problem, when the bag holds too much airDiet With a Stoma: What to Eat and AvoidHow food changes the thickness of outputStoma Care for an Elderly or Bedbound PatientPancaking is common when someone lies still for long
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Pancaking causing leaks?
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