Medical Oncologist
Children
Appetite in children on chemotherapy
Prioritise fluids, stop making meals a battle, and look for the physical reason underneath. Children rarely stop eating out of stubbornness during treatment — underneath it is usually a sore mouth, uncontrolled sickness, constipation, taste changes or exhaustion, and each of those is treatable. Growth is why this matters more in children, and why the team wants to know early.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
What do you do when a child stops eating?
Prioritise fluids, stop making meals a battle, and look for the physical reason underneath. Children rarely stop eating out of stubbornness during treatment. Underneath it is usually a sore mouth, sickness that is not fully controlled, constipation, taste changes or simple exhaustion — and each of those is treatable.
Growth is the reason this matters more in children than in adults. A child who eats poorly through a long course loses weight they cannot spare, and the paediatric team will want to know early rather than after several cycles.
Weigh, and let the team see the numbers
Weight is checked at every visit, and it is the measure that decides whether anything needs doing. Between visits, a weekly weight written on a sheet is the most useful thing a parent can bring, and it is far more reliable than an impression of how much is being eaten.
Ask the paediatric team at what point they want to hear about weight or intake, rather than waiting to be asked.
!
Go to hospital the same day
A fever · refusing all fluids, or drinking far less than usual · far fewer wet nappies than normal, or no urine passed · unusually sleepy, floppy or hard to rouse · vomiting where nothing stays down · no tears when crying, or a dry mouth and tongue · a swollen or hard stomach. Go to the nearest emergency department and say clearly that the child is on chemotherapy. Children dehydrate considerably faster than adults, so do not wait to see how the night goes.
Not sure whether this applies to you?
Ask an oncologistFinding the reason
What is usually in the way
Naming which of these applies is the most useful thing to bring to the appointment.
A sore mouth
Children often will not say that eating hurts; they simply refuse. Look inside with a torch daily for ulcers, white patches and redness. Drooling, or refusing a favourite drink, are useful clues.
Ask about
- Pain relief timed before meals
- Treatment if there are white patches
Sickness not fully controlled
Even mild ongoing nausea suppresses appetite completely in a child. If the anti-sickness medicine is not holding, say so — the plan can usually be strengthened.
Give the medicines on schedule, including on days the child seems well.Constipation
Very common because anti-sickness medicines slow the bowel, and frequently missed. A loaded bowel causes fullness and nausea, and treating it often restores appetite on its own.
Taste changes and aversions
Food tastes metallic or of nothing, and a dish eaten near a bad episode can be refused for a long time afterwards. Keep favourites away from treatment days for exactly this reason.
Exhaustion
Eating is work. A very tired child will refuse food they would otherwise take, particularly later in the day. Offer the largest amount when energy is best, usually earlier.
The atmosphere at the table
Where every meal has become a negotiation, intake falls further. This is the one obstacle the family controls directly, and changing it usually shows within days.
At home
Getting more in without a fight
Offer small amounts often rather than meals, and put them within reach without announcing them. A plate placed quietly nearby is finished far more often than one that arrives with a question attached.
Make every mouthful count
Ghee in rice or khichdi, milk instead of water in porridge, cheese or paneer melted into things, a spoon of milk powder in a shake, mashed egg in upma. The aim is more energy and protein in a smaller volume rather than a bigger plate.
Cool, soft and familiar
Curd rice, ragi kanji, custard, cold milk, banana milkshake, ice cream, mashed banana. Cool food carries less smell and suits a sore mouth. Now is not the time to introduce anything new or to insist on a balanced plate.
Relax the usual rules, within reason
During the difficult days, food eaten beats food that is ideal. Sweets and packaged snacks are acceptable if they are what goes down, with something containing protein alongside. The exception is food safety during the low-count days, which is not negotiable — no street food, nothing left standing, nothing pre-cut.
Never force-feed
Beyond the distress, it carries a genuine risk of choking in a child who is drowsy or whose mouth is sore, and it can create aversions that last for years. If intake has fallen far enough to make it feel necessary, that is the point to involve the team instead.
Ask for a paediatric dietitian rather than waiting to be offered one. Earlier support often prevents the need for anything more.Being straight with you
What this page cannot tell you
It cannot tell you how much your child needs. That depends on age, weight, treatment and growth, and paediatric targets are calculated rather than estimated. A paediatric dietitian is the right person for that, and asking for one early is reasonable rather than premature.
It also cannot tell you why your child has stopped eating. That needs someone to look in the mouth, feel the stomach and see the blood results. What it can tell you is that there is nearly always a physical reason, and that finding it works better than persuading.
What to do next
Weigh weekly and write it down. Look in the mouth daily with a torch. Check when the last proper motion was. Offer small amounts without comment and keep favourites off treatment days. Ask for a paediatric dietitian if weight is falling, and treat a fever as an emergency every time.
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Questions we are asked
Common questions about children and eating
How long can a child go without eating?
Ask your paediatric team for their threshold rather than setting one yourself, because the margin is smaller than in adults. Not drinking is the urgent problem; a day of very little food while fluids continue is usually manageable. A fever changes the answer immediately.
Should we let him eat only sweets and chips?
During the difficult days, within reason, yes — food eaten beats food that is ideal, and battles over nutrition make the next meal harder. Add something with protein alongside where you can. Food safety during the low-count days is the one rule that does not bend.
Is it alright to bribe or reward eating?
Small encouragement is fine; making food a transaction usually backfires and adds pressure to a moment that is already difficult. Ask the play specialist in the paediatric unit for approaches suited to your child's age — they deal with this every day.
She has stopped drinking milk, which was most of her diet. What now?
Try it cold, in a different cup, flavoured, as a shake, or as curd, custard or kanji made with milk. If it is being refused because the mouth hurts, that needs treating rather than working around. Tell the team, since losing a staple narrows a child's diet quickly.
Should we buy a children's supplement drink?
Ask the paediatric dietitian first. Some are genuinely useful when weight is falling, and the amount matters at a child's size. Homemade milkshakes with banana, ground nuts and milk often do the same job for much less, and are more likely to be drunk.
Will he catch up on growth afterwards?
Most children do regain weight and resume growing after treatment, and growth is monitored at follow-up for exactly this reason. Ask the team what they are tracking. Weight or height that does not pick up after treatment should be raised rather than assumed to be temporary.
Grandparents keep pushing food. How do we manage it?
Ask the doctor or nurse to explain at an appointment with the family present — instructions from the team are accepted where the same words from a parent are not. Give relatives a useful job instead, such as keeping the fridge stocked or cooking away from the child.
When would a feeding tube be considered?
Usually when weight keeps falling despite everything tried, or when the mouth or throat makes eating impossible. In children it is offered earlier than in adults because growth matters. It is temporary support so treatment can continue, not a sign that things have gone wrong.
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Sources
- National Cancer Institute — Nutrition in Cancer Care (PDQ)
- Cancer Research UK — Children's cancer treatment side effects
- Macmillan Cancer Support — Eating problems and cancer
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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