Medical Oncologist
Gut and stomach
Acid reflux during chemotherapy
Usually the steroids. They are given alongside many chemotherapy schedules to control sickness, and they irritate the stomach lining, with anti-sickness medicines and lying down more than usual adding to it. It is common and treatable, and worth mentioning rather than enduring — reflux worsens nausea, nausea reduces eating, and treating the acidity often settles both.
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
Why has heartburn started during chemotherapy?
Usually the steroids. They are given alongside many chemotherapy schedules to control sickness and reactions, and they irritate the stomach lining. Some anti-sickness medicines, painkillers, eating small amounts through the day and lying down more than usual all add to it.
It is common, it is treatable, and it is worth mentioning rather than enduring, because reflux makes nausea worse and nausea makes people eat less. The two feed each other, and treating the reflux often improves the sickness more than increasing the anti-sickness medicine.
What it actually feels like
Burning behind the breastbone, often rising towards the throat. A sour or bitter taste at the back of the mouth, particularly on waking. A dry cough or a hoarse voice that nobody connects to the stomach. Pain high in the stomach that is worse lying down and eases sitting up. Any of these can appear without the classic heartburn people expect, which is why it often goes unmentioned.
Why not just buy an antacid
Because several of the medicines used for acidity affect how other tablets are absorbed, which matters if any part of your treatment is taken by mouth. Your team will tell you what is suitable and how to space it. Ask rather than choosing at the counter.
If you are already taking something for acidity, tell your oncologist. It may need spacing away from your other medicines.
!
Not everything that burns is acidity
Go to an emergency department the same day if there is chest pain with breathlessness, sweating, or pain spreading to the arm or jaw · vomit containing blood or looking like coffee grounds · black tarry motions · difficulty or pain on swallowing that has come on quickly · or a fever. Say clearly that the person is on chemotherapy. Heart problems, bleeding from the stomach and infection in the food pipe can all feel like heartburn, and none should be treated with an antacid at home.
Not sure whether this applies to you?
Ask an oncologistWhat helps
Practical measures that work
Most of this is about timing and position rather than medicine, and none of it needs a prescription.
Do not lie down after eating
Stay upright for a while after every meal, even a small one. Lying flat lets stomach contents move back up, and this is the commonest avoidable trigger during treatment.
Also
- Leave a gap before bed
- Raise the head of the bed a little
Small amounts, more often
A full stomach pushes contents upwards. Six small offerings suit reflux for the same reason they suit nausea, and they mean the stomach is never empty either, which also triggers burning.
Take the steroids as instructed
Usually with food and earlier in the day rather than at night. If nobody told you when to take them, ask — the timing affects both the acidity and the sleeplessness they cause.
Never stop or reduce a steroid dose on your own. They are tapered carefully.Ease off the obvious triggers
Very oily and fried food, heavy masala on an empty stomach, strong tea and coffee, and citrus in quantity. This is temporary rather than a permanent restriction.
Treat the constipation
A loaded bowel pushes upwards and worsens both reflux and nausea. This connection is frequently missed, and dealing with it often settles the burning without anything else.
Stop smoking and chewing tobacco
Both relax the valve at the top of the stomach and make reflux considerably worse, quite apart from everything else they do during treatment. The team can help you stop.
About the medicines
What your team may prescribe, and why timing matters
Several categories of medicine are used for acidity, working in different ways — some neutralising acid directly, some reducing how much is produced. Many people on chemotherapy are given something routinely alongside steroids, precisely because this is so predictable.
Why you should not simply buy one
Some acid medicines change how other tablets are absorbed. If any part of your treatment is taken by mouth, or you take medicines for thyroid, heart or infection, the spacing between them matters. Your team can tell you what to take and when; a chemist counter cannot, because they do not have your list.
What to ask
Should I be taking something routinely with the steroids? Which one? How far apart from my other tablets? And what should I do if it does not settle? Write the answers down with the rest of your instructions.
If it is not settling
Reflux that continues despite treatment, or that comes with difficulty swallowing, should be reported rather than managed with more antacid. A fungal infection spreading into the food pipe causes pain on swallowing and burning, and it is treated completely differently.
Nothing here should be used to start, stop or change a prescribed medicine.Being straight with you
What this page cannot tell you
It cannot tell you that what you are feeling is acidity. Burning behind the breastbone is one of the least specific symptoms in medicine. Heart problems, bleeding from the stomach, infection in the food pipe and gallbladder problems can all present this way, and some of those are urgent.
It also cannot tell you which medicine is safe for you or how to space it. That depends on everything else you take, including any oral chemotherapy, and getting the spacing wrong can reduce how well another medicine works.
What to do next
Start with the position and timing measures today — upright after meals, small amounts often, steroids with food and earlier in the day. Ask your team whether you should be on something routinely and how to space it. And if there is chest pain, blood, or new difficulty swallowing, treat that as urgent rather than as heartburn.
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Questions we are asked
Common questions about acidity during chemotherapy
Is it the chemotherapy or the steroids?
More often the steroids, which irritate the stomach lining directly and are given alongside many schedules. Some anti-sickness medicines, painkillers and reduced eating add to it. Usually several things contribute at once, which is why the answer is rarely to stop one of them.
Can I take an antacid from the chemist?
Ask your team first, and take your medicine list with you. Several acid medicines change how other tablets are absorbed, which matters particularly if any of your treatment is taken by mouth. Most teams will simply prescribe something suitable and tell you how to space it.
Can acidity make the sickness worse?
Yes, and the two feed each other. Reflux causes nausea, nausea reduces eating, an empty stomach worsens burning. Treating the acidity often improves the sickness more than increasing the anti-sickness medicine does, which is why it is worth mentioning separately.
Should I stop eating spicy food permanently?
Not permanently. Ease off heavily spiced and oily food while the burning is bad, particularly on an empty stomach, and bring it back as things settle. A blanket restriction across the whole course usually leads to meals being refused and weight falling, which causes more trouble than the spice.
Is chest burning ever something serious?
It can be. Chest pain with breathlessness, sweating, or pain spreading to the arm or jaw needs an emergency department the same day, not an antacid. So does vomiting blood, black tarry motions, or new difficulty swallowing. Do not assume a burning chest is acidity.
Why is it worse at night?
Lying flat lets stomach contents move back up. Leave a gap between the last food and bed, raise the head of the bed slightly rather than piling pillows under your head, and ask about the timing of the steroid dose, since taking it earlier often helps both the acidity and the sleeplessness.
Is milk a good remedy for it?
It soothes briefly and many people find it helpful, particularly cold milk. It is not a treatment, and for some it causes a rebound later. It is fine to use for comfort alongside whatever your team has prescribed, and it has the advantage of carrying protein and fluid too.
Will it stop when treatment ends?
For most people yes, as the steroids stop and eating returns to normal. It usually settles within weeks. Acidity that continues well after treatment has finished should be reviewed rather than treated indefinitely with over-the-counter medicine, since the cause may be something else.
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Sources
- Cancer Research UK — Steroids and cancer treatment
- National Cancer Institute — Gastrointestinal Complications (PDQ)
- Macmillan Cancer Support — Indigestion and cancer treatment
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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