Fever on Chemotherapy — Is an Emergency Right Now
A temperature of 38°C or above during chemotherapy is not ordinary fever. Your white blood cells may be too low to fight any infection, and a serious infection can become life-threatening within hours if it is not treated.
Medically reviewed by Dr. N. Kiranmayee, Medical Oncologist · Last reviewed September 2026
- 38°C or above means go now — This is the threshold at which fever on chemotherapy becomes a medical emergency — not a same-day call, not a wait-and-see.
- Your immunity is very low — Chemotherapy reduces the white blood cells that fight infection. What looks like ordinary fever can become sepsis within hours.
- Tell triage immediately — The moment you arrive, say you are on chemotherapy. This changes your priority in the emergency department.
- Know where to go before it happens — Your oncology team will have named a specific emergency department. Find that out tonight, before you have a fever.
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A temperature of 38°C or above during chemotherapy is a medical emergency. NCCN and ASCO classify this as febrile neutropenia — your immune system cannot fight infection normally, and delay can be fatal. Go to hospital immediately. Do not wait for your oncologist to call back.
If a symptom below applies to you, do not wait for a callback. Call 1800-202-8726 or go to your nearest emergency department.
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Not sure whether this counts as an emergency?
Call the helpline. It is always better to check than to wait.
How fast do you need to act?
NCCN and ASCO guidance is clear: fever on chemotherapy needs hospital assessment within the hour, not a phone call and not a wait-and-see.
The days after a chemotherapy cycle are when your white blood cell count is at its lowest. At that point your body cannot contain even a minor infection the way it normally would.
If you have taken a temperature-lowering medicine before arriving, tell the emergency team what you took and when. Your reading may not reflect how high the fever was.
At triage, say you are on chemotherapy before anything else. That is the fastest way to be prioritised correctly.
What temperature is an emergency on chemotherapy?
| Temperature | What it means | What to do |
|---|---|---|
| Below 37.5°C | Normal range | Monitor. If you feel unwell for any other reason, call your oncology team. |
| 37.5°C to below 38°C | Borderline — check again in 30 minutes | If rising, or you feel unwell in any way, go to hospital now. Do not wait to reach 38°C. |
| 38°C or above | Fever — this is the emergency threshold | Go to hospital immediately. Tell triage you are on chemotherapy. |
| Typically starts | In the week or two after each chemotherapy cycle — the nadir period | Know your cycle dates. Fever risk is highest when your white cells are at their lowest. |
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Frequently asked questions
What exactly is febrile neutropenia?
Febrile neutropenia means you have a fever while your white blood cell count is too low to fight infection — a direct result of chemotherapy. It is dangerous because your usual immune defences are not working, so bacteria that your body would normally contain can spread rapidly. NCCN and ASCO both classify it as an oncological emergency. Treatment is antibiotics started quickly in hospital, and most people respond well when it is caught early.
What will happen when I arrive at the emergency department?
Tell the triage nurse immediately that you are on chemotherapy and have a fever. You will be prioritised, and a blood count will be taken quickly to check your white cell level. The team will look for the source of infection and typically start antibiotics within the hour of your results. Bring your chemotherapy card, your drug list, and your oncologist's contact details. You will almost certainly be admitted, at least initially.
Does fever on chemotherapy mean my treatment will have to stop?
Not necessarily, and not permanently. Febrile neutropenia is a side effect of treatment, not a sign the treatment is failing. Your oncologist may adjust the dose or timing of your next cycle after this episode, or add a medicine to protect your white cell count. The decision depends on how severe the reaction was and how well you recover. Treating it early is what keeps the most options available.
Can I wait until morning to see if the fever settles?
No. Waiting overnight is one of the most dangerous decisions you can make with fever on chemotherapy. Infections in patients with low white blood cell counts can progress to sepsis within hours. NCCN and ASCO guidance is that assessment must happen within the hour, not the next morning. If it is the middle of the night, go now. Emergency departments do not close.
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