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Blocked feeding tube: how to clear it and prevent it | CION Cancer Clinics
If a PEG tube is blocked, stop the feed, check for kinks, and flush gently with warm water using a large syringe, pushing and pulling back slowly. If it does not clear after a few careful tries, call your team or go to hospital. Never force it or push anything solid down the tube. This page covers clearing it, when not to wait, and how to stop it happening again. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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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 should you do if the PEG tube is blocked?
- How do you try to clear a blocked tube safely?
- Why do feeding tubes block?
- How do you stop the tube blocking again?
- What home remedies for blocked tubes should you avoid?
- What happens at hospital, and what can this page not tell you?
- Common questions about a blocked feeding tube
The short answer
What should you do if the PEG tube is blocked?
Stop the feed and try to flush the tube gently with warm water using a large syringe, pushing and pulling back slowly. If it does not clear after a few careful tries, call your team or go to hospital. Never force it, and never push anything solid down the tube.
Why a blocked tube matters
While the tube is blocked, no feed, water or medicine is getting in. A few hours is usually manageable. A whole day without fluids or regular medicines is not, especially for someone who cannot drink by mouth, or who takes medicines for fits, diabetes or the heart.
Why forcing it is dangerous
Pushing hard with a small syringe builds up a lot of pressure inside the tube. That can split the tube or burst the balloon that holds some tubes in place. Wires, skewers and knitting needles can pierce the tube wall or the stomach. A split tube has to be replaced, which is a much bigger problem than a blocked one.
Your team may have given you instructions for your particular tube. Follow those over anything on this page.Step by step
How do you try to clear a blocked tube safely?
Check for a kink or clamp
Look along the whole tube. Make sure the clamp is open, the tube is not bent under clothing, and the person is not lying on it. This is a common cause.
Use a large syringe and warm water
Fill the large feeding syringe your team gave you with warm, not hot, boiled water. Small syringes build more pressure and are more likely to split the tube.
Push and pull gently
Push a little water in, then pull back gently on the plunger. Repeat slowly a few times. Leave the water sitting in the tube for a while, then try again.
Stop and call if it will not move
If there is no movement after several gentle tries, stop. Call the team or the helpline and say the tube is blocked. Do not keep trying through the night.
Not sure whether this applies to you?
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When a blocked tube cannot wait until morning
Go to the nearest emergency department the same day if the tube will not clear and the person cannot drink by mouth, has missed important medicines, has pain or swelling around the tube, or if the tube has split or moved out. Take the tube details and medicine list. Do not cut the tube or pull it out yourself.
The causes
Why do feeding tubes block?
Most blocks come from a handful of everyday habits, and most of them can be prevented.
Missed flushes
Feed left sitting in the tube dries into a film on the inside wall. Each missed flush adds a layer until the tube narrows and closes.
Crushed tablets
Tablets that are not crushed finely, or not dissolved in water first, form a paste that sticks. Mixing several medicines together makes this worse.
Thick feeds and blends
Home blends that are not strained, or feeds with powder added, can lodge in the narrowest part of the tube.
Also causes clumping
- Medicines mixed into the feed
- Milky tea or juice through the tube
An old or narrow tube
Tubes wear with time and thinner tubes block more easily. If blocks keep happening, the tube may need changing.
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Every day
How do you stop the tube blocking again?
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Flush before and after every feed
Use a syringe of clean boiled and cooled water each time, even if the feed was small. Flush between medicines too.
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Flush during long pump feeds
If feed runs through a pump for many hours, pause and flush at the times your team gave you.
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Ask for liquid medicines
Ask your doctor or pharmacist which medicines come as liquids. If a tablet has to be crushed, crush it to a fine powder and mix it in water. Give each one on its own.
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Strain every home blend
Push it through a fine sieve and check it draws into the syringe easily.
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Flush once a day when the tube is not in use
If the person is eating by mouth and the tube is resting, keep flushing daily so it stays open.
Commonly believed
What home remedies for blocked tubes should you avoid?
"Cola or pineapple juice will dissolve the block."
These are widely suggested, but they can curdle feed and make the block worse, and the evidence for them is weak. Warm water works as well or better. Only use anything else if your own team has told you to.
"A thin wire will push it through."
Anything stiff pushed down the tube can pierce it or the stomach wall. Some hospitals have special tools for clearing tubes, used by trained staff. This is not something to try at home.
"If we cannot clear it, we should cut the end off."
Cutting the tube can leave the rest free to slip inside, and on some tubes it damages the part that keeps the balloon filled. Bring the person and the tube to hospital as they are.
"A blocked tube always means a new operation."
Most blocks are cleared on the ward or in the emergency department without any procedure. If the tube does need changing, many tubes can be replaced through the same opening without surgery.
Being straight with you
What happens at hospital, and what can this page not tell you?
At hospital, the nurse or doctor will usually try flushing again with the right equipment. Some teams use a special solution that softens feed blocks. If the tube still will not clear, or is damaged, it is replaced.
Replacing the tube
How the tube is replaced depends on its type and how long it has been in. A balloon tube in a settled opening can often be changed on the ward. A newer tube, or one placed by endoscopy, may need a short procedure. Your team will explain which applies to you.
What this page cannot do
It cannot tell you which type of tube you have, or whether a warning sign is serious for your situation. Keep the tube details from the discharge summary with the feeding supplies, so anyone who helps knows what they are dealing with.
Questions we are asked
Common questions about a blocked feeding tube
How long can he go without the tube working?
It depends on whether he can drink by mouth and which medicines he takes. Someone who can sip water and has no critical medicines can usually wait a few hours for help. Someone who takes nothing by mouth, or needs medicines for fits, diabetes or the heart, should be seen the same day.
Can I use hot water to clear the block?
Use warm water, not hot. Hot water can soften or damage the tube and scald the stomach lining. Warm boiled water, pushed and pulled back gently with a large syringe and left to sit for a while, is what most teams advise first.
Is it normal for the tube to block often?
An occasional block happens to most families at some point. Frequent blocks are a sign that something needs changing, such as more flushing, liquid medicines, a thinner blend or a new tube. Tell the team if it happens more than once or twice so they can find the cause.
Can crushed tablets really block the tube?
Yes. They are one of the commonest causes. Some tablets also must not be crushed at all. Ask the pharmacist to go through the list and suggest liquids where possible. Never stop or change a medicine yourself because it is hard to give through the tube.
The water goes in but will not come back out. Is it blocked?
Not necessarily. If water and feed go in without resistance, the tube is usually open. It is common for nothing to draw back, because the tip can sit against the stomach wall. If you are unsure, or the person has pain, call the team before feeding.
Should we try cola like someone suggested?
Only if your own team has specifically told you to for your tube. Many guides now advise warm water instead, because fizzy drinks and juices can curdle with feed and make blocks worse. If warm water has not worked, the safer next step is to call.
What if the blocked tube has a balloon?
Do not touch the balloon port or let water out of the balloon while trying to clear the block. The balloon keeps the tube inside the stomach. Flush only through the feeding port, and call the team if the block does not clear.
What should we take to hospital?
Take the discharge summary with the tube type and size, the medicine list, the feeding syringes you use and any spare tube or kit you were given. Tell the staff when the tube was placed and when it blocked. This helps them decide quickly whether to clear it or replace it.
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Sources
- Cancer Research UK — Diet problems with cancer
- National Cancer Institute — Nutrition in Cancer Care (PDQ) - Patient Version
- Macmillan Cancer Support — Impacts of cancer: eating and drinking
- NICE — Nutrition support for adults (CG32)
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
What if the tube falls out?The other tube problem that cannot waitWhat to put through a feeding tubeFeeds and medicines that are safe for the tubeFeeding through the tube: how it is done at homeThe flushing routine that prevents blocksDrains, tubes, lines and cathetersOther tubes you may go home with
Talk to us
Tube blocked and not clearing?
Call the helpline. A nurse will talk you through the next step or tell you where to go. One helpline serves every CION centre.