Medical Oncologist
Nausea and sickness
Feeling sick before treatment starts
The body has learned to associate the hospital with feeling sick. After a bad cycle or two, the sight of the unit, the smell of the corridor or even the drive there can set off the same response the drugs did, so nausea begins before anything is given. It is a real physical reaction with a name, and it is the one pattern of chemotherapy sickness that reliably worsens if nothing is done.
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 do you feel sick before treatment has even started?
Because the body has learned to associate the hospital with feeling sick. After a bad cycle or two, the sight of the day-care unit, the smell of the corridor, or even the drive there can set off the same response that the drugs did. Nausea begins before anything has been given.
This is a real physical reaction, not imagination and not weakness. It has a name, it is well recognised, and teams see it regularly. It is also the one pattern of chemotherapy sickness that genuinely worsens with each cycle if nothing is done about it.
Why it matters that you say something
Most people do not mention it, because it sounds like a failure of nerve rather than a symptom. The result is that it goes untreated and strengthens each time, until some people start vomiting in the car park. Raised early, it responds well.
The best prevention is getting the sickness after the first cycles properly controlled, so the association never forms.What it looks like
How to recognise it
It is defined by when it happens rather than by how it feels. Anything triggered before the drug is given belongs here.
Sickness on the journey
Nausea starting in the car or bus on the way to the hospital, sometimes from the moment of waking on treatment day. Some people vomit before arriving.
Also counts
- Sickness the night before
- Being unable to eat breakfast that day
Triggered by a smell
Antiseptic, the ward corridor, the day-care unit itself. Some people react to a smell they cannot name. Others find a particular perfume or soap sets it off because it was worn on a bad day.
Triggered by a sight or sound
The building, the waiting room, the sight of a drip stand, the nurse who gave the last cycle. Occasionally a television programme that was on during a bad afternoon.
None of this is unusual. The body learns associations without asking permission.Dread and anxiety with it
Sleeplessness the night before, a racing heart on arrival, or a strong urge to cancel. The physical and the emotional sides feed each other, which is why both are treated.
Aversion to a particular food
The same learning process can attach to a dish eaten on treatment day or before a bad night. People can be put off a favourite food for years by one bad association.
Not sure whether this applies to you?
Ask an oncologistWhat is done about it
How it is treated
The first step is always to make sure the sickness after treatment is properly controlled, because an association that keeps being reinforced will not settle. Strengthening the anti-sickness plan often reduces the anticipatory part on its own.
Medicine taken before you come in
Your team may prescribe something to take on the morning of treatment, or occasionally the night before. This is a recognised approach rather than an unusual request, and for many people it is the thing that breaks the cycle. Ask about it specifically.
Relaxation and distraction
Breathing exercises, music through headphones, a film on a phone, or simply having someone to talk to during the infusion all help more than they sound like they would. Some units teach a technique; some counsellors work specifically on this.
Changing what the body associates
Sitting in a different chair, coming at a different time of day, taking a different route, or changing the soap or perfume worn on treatment days. These sound trivial and they genuinely reduce the triggers.
Counselling
Where dread has become severe, a counsellor or psychologist experienced in cancer care can work on it directly. Asking for that is not an overreaction — it is what the service is there for, and it works.
Do not take a sedative or anti-anxiety tablet from a relative before treatment. Ask your own team, because some interact with what you are being given.Practical steps
Things worth trying on treatment day
- Take any medicine prescribed for before treatment exactly when told
- Eat something light and plain before setting out, never travel on an empty stomach
- Avoid a favourite dish that day, so it does not get spoiled by association
- Take headphones and something absorbing to watch or listen to
- Bring someone with you, so there is conversation rather than waiting in silence
- Ask for a different chair or a quieter corner of the unit if that helps
- Carry a cut lemon or something with a clean smell to counter the ward smell
- Sip cool water or suck ice chips through the wait rather than sitting dry
- Tell the day-care nurse on arrival that this happens to you
!
One thing that cannot wait
If vomiting before treatment has meant nothing has stayed down for most of a day, that is dehydration rather than anxiety, and it needs the same response as any other cause. Go to the nearest emergency department the same day and say clearly that the person is on chemotherapy. Never skip a scheduled treatment without telling your team — a cycle missed quietly is far more serious than one rescheduled openly.
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Being straight with you
What this page cannot tell you
It cannot tell you which approach will work for you. Anticipatory sickness responds differently in different people, and the mix of medicine, distraction and counselling that suits one person does little for another. It usually takes trying more than one thing.
It also cannot promise it will go completely. For many people it becomes manageable rather than absent, particularly if it has been building for several cycles before anyone was told. That is a reason to raise it early rather than a reason not to raise it at all.
What it should not be used for
Do not use it as a reason to skip treatment. If the dread has reached the point where you are considering not going, tell your team that directly. That sentence gets a serious response, and there is usually a way through it — rescheduling, a different approach on the day, or proper support.
What to do next
Tell your team at the next contact, in plain words: "I start feeling sick before I get there." Ask whether something can be taken beforehand. Take headphones and someone with you next time. And make sure the sickness after treatment is being properly controlled, because that is what feeds it.
Questions we are asked
Common questions about sickness before treatment
Is this all in my head?
No. It is a learned physical response, the same way the mouth waters at the smell of food. The body has connected the hospital with feeling sick and produces the reaction in advance. It is well recognised, it has a name, and it is treated — not something to be embarrassed about.
Will it get worse with more cycles?
If nothing is done, usually yes — it is the one pattern of chemotherapy sickness that reliably strengthens, because each cycle reinforces the association. Treated early it responds well. That is the main reason to mention it in the second or third cycle rather than the sixth.
Can I take something before I come in?
Often yes, and this is worth asking for directly. Your team may prescribe something for the morning of treatment or the night before. Do not take a sedative borrowed from a relative, as some interact with what you are being given.
Does it mean I am not coping well?
No. It happens to people who are managing everything else well, and it is more closely related to how badly the early cycles went than to anyone's temperament. Treating it as a character issue is precisely why it stays hidden and gets worse.
Why can I not eat my favourite food any more?
The same learning process. If a dish was eaten close to a bad episode, the body can connect the two and the aversion can last a long time. It is why it is worth avoiding favourite foods on treatment days. Most aversions fade with gentle reintroduction after a gap.
Would changing hospitals help?
Rarely worth the disruption, and the association often transfers. Smaller changes within the same unit help more — a different chair, a different time of day, a different route in, or a change of the perfume or soap worn on treatment days. Ask what can be accommodated.
My daughter has this before her paediatric treatment. Same thing?
Yes, and children are, if anything, more prone to it. Paediatric teams deal with this constantly and have their own approaches, including play specialists and distraction techniques. Raise it with them rather than adapting adult advice.
Will it stop once treatment finishes?
For most people it fades over the months afterwards, though some find hospital visits and particular smells uncomfortable for a long time. If it is still affecting follow-up appointments well after treatment has ended, mention it — that is worth addressing rather than enduring.
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Sources
- National Cancer Institute — Nausea and Vomiting Related to Cancer Treatment (PDQ)
- Cancer Research UK — Sickness and cancer drugs
- Macmillan Cancer Support — Feeling sick and being sick
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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