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Stoma bag leaks: why they happen and how to fix them | CION Cancer Clinics
A stoma bag usually leaks because output has found a gap between the baseplate and your skin. The commonest reasons are a hole cut to the wrong size, a crease or dip beside the stoma, watery output, or a bag worn too long. Most leaks can be fixed by re-measuring and refitting. This page shows how to find your cause and when to get help. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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The short answer
Why is my stoma bag leaking?
Most leaks happen because output has found a gap between the sticky baseplate and your skin. The usual reasons are a hole cut to the wrong size, a crease or dip in the skin around the stoma, or a bag left on after the seal has started to wear.
Why it matters to fix it early
A small leak rarely stays small. Output that sits on the skin makes it red and sore, and a baseplate will not stick well to sore, damp skin. That causes the next leak sooner, and the cycle repeats. Finding the cause in the first few days is far easier than treating broken skin later.
Leaks are common, and they are not your fault
Almost everyone with a new stoma has a leak at some point. The stoma changes size and shape as the swelling from surgery settles, and your body shape changes as you recover and put weight back on. A bag that fitted well in hospital may not fit a few weeks later. That is a reason to re-measure, not a sign that you are doing something wrong.
If you are leaking more than once in a short spell, stop changing products on your own and ask a stoma nurse to look at the stoma and the skin with you.Finding the cause
What usually causes a leak?
Look at where the output came out. The position of the leak is often the clue to its cause.
The hole is the wrong size
Too big, and bare skin is left for output to sit on. Too small, and the edge rubs or cuts into the stoma. Stomas shrink over the first weeks, so the size you were given in hospital often needs changing.
Creases, dips and scars
When you sit or bend, the skin near the stoma can fold. Output travels along the fold and under the seal. A nearby scar or a soft tummy does the same.
Often helped by
- Filler paste or a seal ring
- Checking the fit sitting down, not only standing
Watery output
An ileostomy gives thin, loose output that slowly eats into the adhesive. Leaks are more common with an ileostomy than a colostomy for this reason.
A bag left on too long or too full
A full or heavy bag pulls on the seal. Gas that swells the bag, or thick output stuck at the top, can lift the edge from underneath.
Heat, sweat and oily skin
Hyderabad summers make the adhesive soften sooner. Creams, oils and talc left on the skin stop it sticking at all.
Not sure whether this applies to you?
Ask an oncologistWhen it has already leaked
How do you fix a leak right now?
Take it all off
Do not patch a leaking bag with tape. Peel the whole baseplate off slowly, pressing the skin down with your other hand as you go. An adhesive remover spray makes this gentler.
Clean and dry the skin
Use warm water and soft gauze or a cloth. Skip soap, perfumed wipes and oils. Pat the skin fully dry, because damp skin is the commonest reason a fresh bag lifts.
Look and measure
Check the skin for redness or raw patches. Measure the stoma with the guide from the box and compare it with the hole you have been cutting.
Fit, then hold
Put the new baseplate on from the bottom edge upwards. Hold your warm palm over it for a minute or so. The warmth helps the adhesive mould to your skin.
Side by side
Which fix matches which leak?
What you notice
What to try first
Output right next to the stoma, all the way round
Re-measure and cut the hole closer to the stoma
A track in one direction, usually towards a fold
Fill the dip with paste or a seal ring
Leaks mostly at night
Empty the bag before bed and check the filter
The stoma sits flat or below the skin
Ask a stoma nurse whether a curved baseplate suits you
The edges peel in hot weather
Change a little sooner and try flange extender strips
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When a leak is not the real problem
Go to an emergency department the same day if the stoma turns dark red, purple or black, if it bleeds and will not stop with gentle pressure, or if the bag has stopped filling and you have cramping pain, a swollen tummy or vomiting. Do not keep changing bags while you wait for these to settle.
Commonly believed
What do families believe about leaks, and what is true?
"Tape it down harder and it will stop."
Extra tape over a leak traps output against the skin. The skin breaks down under it, and the next bag sticks even less. A leaking bag needs to come off and be fitted again.
"Eat less and there will be less to leak."
Cutting meals makes output thinner and less regular, which leaks more easily. It also slows healing after surgery. Eating small regular meals helps far more than eating less.
"Coconut oil or turmeric will heal the sore skin."
Anything oily under a baseplate stops it sticking, so the leak returns within hours. Sore skin needs products made for use under an appliance, chosen with your stoma nurse.
"The most expensive bag will not leak."
Fit matters more than price. A basic bag cut to the right size often seals better than a costly one that does not suit the shape of your tummy.
Being straight with you
What can this page not tell you?
This page cannot see your stoma. Two people with the same kind of stoma can need completely different products, because the stoma height, the skin around it and the shape of the tummy all differ. General tips help with most leaks. They do not replace someone looking at the fit.
Who the stronger products do not suit
Curved baseplates and support belts are useful for a stoma that sits flat or in a dip. They press into the tummy, though, so they are not right for everyone. A recent operation, a bulge around the stoma or very sore skin can all make them unsuitable. Ask before you buy one on the advice of a shop or a relative.
When to ask for help
Ask for a review if leaks keep happening after you have re-measured, if the skin stays raw, or if your weight has changed a lot. Bring a used baseplate in a bag. The pattern of output on the back of it shows the nurse exactly where the seal failed.
If you are caring for a parent who cannot tell you when the bag feels wet, check the edges at a set time each day.Questions we are asked
Common questions about stoma bag leaks
Why does my bag leak only at night?
At night the bag fills while you lie still, and output pools near the stoma instead of dropping down. Gas can also swell the bag against the mattress. Emptying just before bed, avoiding a large late meal and lying slightly on the stoma side often helps. A stoma nurse can suggest a night drainage bag if leaks continue.
How do I know the hole is the right size?
The hole should sit close around the stoma without touching it, leaving only a very thin ring of bare skin. Use the measuring guide in the box rather than guessing. Measure again every week or so while the swelling settles, and any time a leak keeps coming from the same edge.
Can sweating make the bag come off?
Yes. Heat and sweat soften the adhesive, so the seal wears out sooner in summer. You may need to change the baseplate a little more often in hot months. Keep the skin free of talc and cream, and ask about extender strips that hold the edges down during work or travel.
The skin is red and wet. Can I still stick a bag on?
A bag will not stick well to raw, weeping skin, and more leaks will follow. There are powders and barrier films made for use under an appliance. Ask a stoma nurse which suits you. If the skin is bleeding, very painful or spreading, show it to your surgical team rather than treating it at home.
Should I change to a different brand?
Only after you have checked the size, the skin and the way you are fitting it. Most leaks are about fit, not brand. Changing brands on your own can mean paying for boxes that do not suit you. A stoma nurse can give you samples to try before you buy.
Is filler paste safe to use every time?
For many people, yes. Paste fills dips and creases so output cannot track under the seal. It is used as a filler, not a glue, so a thin line is enough. Some pastes contain alcohol and sting on sore skin. Alcohol-free versions and seal rings exist for that.
Will leaks get better with time?
For most people they become much less frequent once the stoma settles into its final size and you find the right product. The early weeks are usually the hardest. If leaks are still frequent after that, something about the fit needs looking at, and it is worth asking for a review.
Are stoma supplies covered by Aarogyasri or insurance?
Cover varies. Supplies used during the surgical stay are often included, while monthly home supplies may not be. Aarogyasri, CGHS, ECHS, EHS and cashless insurers each have their own rules. Call the helpline with your card details and we will help you find out what your own cover includes.
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Sources
- NHS — Ileostomy
- NHS — Colostomy
- 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.
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