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A practical plan for home
Nausea is the feeling that you may vomit. Vomiting means bringing up the contents of your stomach. Both can happen during cancer treatment, but medicines can often prevent or reduce them. Take your anti-sickness medicines as prescribed and tell your team if they are not helping. Ask for help before repeated vomiting makes eating or drinking difficult.
Nausea without vomiting still matters. It can make eating, drinking, travelling or taking medicines difficult. Tell the team about these effects even if you have not actually been sick. A change to the plan may make the next few days easier.
Why does nausea happen?
Different treatments have different risks. Some cause symptoms soon after treatment; others can cause delayed nausea over the following days. Radiotherapy risk depends partly on the area treated. Cancer tablets can also cause ongoing or intermittent symptoms. The prevention plan should match your treatment, rather than simply copying another patient's medicines.
Other problems can contribute, including constipation, pain medicines, infection or changes in the body's blood chemistry. Sometimes nausea has a cause that needs separate treatment. Report a new pattern, particularly if nausea appears with severe pain, swelling of the abdomen, headaches or other new symptoms.
Feeling well on the infusion day does not always mean you can stop the tablets prescribed for later days. Conversely, more anti-sickness medicine is not automatically better. Follow the written schedule and ask before making changes.
Understand your medicines before leaving the unit
Your prescription may include regular medicines to prevent nausea and an extra, or “rescue”, medicine to take if nausea starts. Several medicines may be needed because they work in different ways. Ask the team to write down which to take regularly and which to use only when needed.
Ask the nurse or pharmacist to explain:
- Which medicines are scheduled, even when you feel well.
- Which medicine is the rescue option if you feel sick.
- The dose, timing and maximum allowed use of each medicine.
- What to do if you vomit after a dose or cannot swallow it.
- Whom to call if nausea continues despite the plan.
Check the names on the boxes against the instructions. If you have old anti-sickness medicines at home, ask whether they still belong in this treatment plan. Do not combine old and new prescriptions without checking, even if the names are familiar.
For someone helping at home, a simple record of what was taken and when can prevent an accidental repeat dose. Keep the prescription and urgent contact number together. If an instruction is unclear, call the pharmacy or treatment team rather than guessing.
If the first plan does not work
Use the prescribed rescue medicine as directed and contact the team if symptoms persist. They may need to change the medicine, how it is given or the prevention plan for the next cycle. Do not keep increasing doses on your own.
If you cannot keep tablets or fluids down, an oral prescription may no longer be enough. Prompt assessment can identify dehydration and whether medicines by another route or fluids are needed. Do not wait until the next scheduled visit because vomiting seems like an expected side effect.
Tell the team if a medicine causes troublesome constipation, dizziness or sleepiness. Do not drive when drowsy. If you have diabetes and receive steroids as part of the anti-sickness plan, ask how to monitor glucose and whom to contact if readings rise. The solution should be agreed with the team, not stopping prescribed prevention yourself.
Eating when the thought of food is difficult
Try small amounts more often instead of facing a large meal. Choose foods that seem manageable that day. Plain rice, toast, a small bowl of soft khichdi or another familiar food may be easier for some people; these are examples, not a special anti-cancer diet.
Add protein and energy as tolerated rather than staying on a very restricted diet for days.
Strong cooking smells can make nausea worse. Better ventilation, someone else preparing the food, or serving it warm rather than very hot may help. If a favourite food starts to remind you of feeling sick, choose something else for now. Caregivers can offer small choices without pressing you to finish a particular meal.
If you take oxaliplatin, follow the team's advice about cold food and drinks. General suggestions to suck ice or drink iced liquids may be unsuitable because this medicine can cause cold-triggered symptoms. Room-temperature options may be more comfortable.
If nausea keeps stopping you eating or you are losing weight, ask for a dietitian’s help. Treating the nausea and finding foods you can manage can help protect your strength.
Drinking without making nausea worse
Small, frequent sips may be easier than a large glass at once. Try the temperature and flavour you tolerate. If vomiting or diarrhoea is causing fluid loss, ask whether an oral rehydration solution would be appropriate and how to use it. Follow any fluid restriction for heart or kidney disease.
Notice if you are passing much less urine, feel very dizzy on standing or cannot drink enough to replace losses. These are reasons to call promptly. Do not force a fixed volume of water when you are repeatedly vomiting; you may need assessment rather than more attempts at home.
What if anxiety or clinic smells trigger sickness?
After a difficult experience, sights, smells or thoughts about treatment can trigger nausea before the next dose. This is sometimes called anticipatory nausea. Tell the team before the appointment. Better symptom prevention, relaxation and specific behavioural support can help; it is not a personal failure.
An easy-to-follow plan for the journey and waiting period may reduce uncertainty. You could ask a companion to handle transport, bring a bag in case you are sick and choose a seat where you feel comfortable. These practical arrangements support treatment; they do not replace prescribed anti-sickness medicines.
Ginger, acupressure and other complementary approaches have mixed evidence and should not replace standard prevention. Check supplements with your pharmacist because ingredients and doses vary and interactions are possible.
Keep a short record for the next review
Note when nausea started, whether you vomited, which medicines you took and whether you could eat and drink. Include constipation, dizziness and missed cancer-tablet doses. A few clear notes are enough; detailed hour-by-hour monitoring is not necessary unless your team requests it.
For example: “I was comfortable on treatment day, but on the second evening I could not eat and vomited twice despite the rescue medicine.” This helps the team improve prevention for the next cycle. Do not wait for that review if you are currently unable to drink or getting worse.
When to seek urgent help
Contact your cancer team urgently if vomiting continues despite your medicines, you cannot keep fluids or essential medicines down, you pass very little urine, or you become increasingly weak or dizzy.
During chemotherapy, a temperature of 38°C (100.4°F) or above needs immediate contact; follow a lower threshold if your unit has given one. Call urgently if you are shivering or suddenly feel very unwell, even without a fever.
Seek emergency help for vomiting blood, collapse, confusion, severe abdominal pain or swelling, breathing difficulty, or a severe headache with new weakness or difficulty speaking. These symptoms may have a cause other than chemotherapy and need prompt assessment.
Common questions
Does vomiting mean the treatment is working?
No. Side-effect severity does not tell you how well cancer treatment is working. Good control of nausea is part of care, not something that reduces the treatment's benefit.
Should I repeat a cancer tablet if I vomit?
Do not automatically repeat it. Follow the drug-specific instructions or contact your team. Tell them which medicine you took and when you vomited; the advice depends on the medicine and situation.
What is the most useful question to ask?
“Could you write down my prevention and rescue plan, and when I should call?” Make sure the person helping at home understands the same instructions.
Sources and further reading
- Herrstedt J, et al. 2023 MASCC and ESMO guideline update for the prevention of chemotherapy- and radiotherapy-induced nausea and vomiting. ESMO Open. 2024;9(2):102195. doi:10.1016/j.esmoop.2023.102195. Read source
- National Cancer Institute. Nausea and Vomiting and Cancer Treatment. Patient guidance. Read source
- Hesketh PJ, et al. Antiemetics: ASCO Guideline Update. Journal of Clinical Oncology. 2020;38(24):2782–2797. doi:10.1200/JCO.20.01296. Read source
- Rapoport BL, et al. 2023 updated MASCC/ESMO consensus recommendations: prevention of nausea and vomiting following multiple-day chemotherapy, high-dose chemotherapy, and breakthrough nausea and vomiting. Supportive Care in Cancer. doi:10.1007/s00520-023-08224-1. Read source
- Macmillan Cancer Support. Nausea and vomiting. Patient guidance. Read source
- Macmillan Cancer Support. Tips for managing eating problems. Read source
- Cancer Research UK. Oxaliplatin. Drug-specific cold precautions. Read source
- National Cancer Institute. Infection and Neutropenia during Cancer Treatment. Read source
- Affronti ML, et al. MASCC 2023 Patient-Centered Antiemetic Guidelines and Education Statements: an evidence-based and consensus resource for patients. Supportive Care in Cancer. 2024;32(6):335. doi:10.1007/s00520-024-08543-x. Read source
Medically reviewed and approved by Dr (Prof) Vijay Agarwal
Professor and Lead Consultant – Medical Oncology
