Chemotherapy Emergencies: — The Complete Warning-Sign Guide
On chemotherapy, some symptoms need the emergency department immediately, some need a same-day call, and some can wait. Knowing the difference can save your life.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026
- Fever is never trivial — Fever with shaking chills is the most urgent emergency on any chemotherapy regimen — go immediately, do not call first.
- Three tiers of urgency — Go now. Call today. Wait for your appointment. This page puts every common symptom into one of those three tiers.
- When in doubt, call — An unnecessary call costs nothing. Missing a serious sign can cost everything.
- Waiting overnight is the risk — Infection and bleeding can worsen within hours on chemotherapy. Same-day contact is always the safer choice.
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On chemotherapy, some symptoms are genuine emergencies that need the hospital now, some need a same-day call, and some can wait for your next appointment. Fever with shaking chills, difficulty breathing and heavy bleeding always mean go now. For everything else, this page shows you how to judge the urgency.
If a symptom below applies to you, do not wait for a callback. Call 1800-202-8726 or go to your nearest emergency department.
Call your oncology team today if you have any of these
- You have any temperature, even mild, without shaking chills
- You cannot keep fluids down for more than a few hours
- You see blood in your urine or stool, even a small amount
- New numbness or tingling in your hands or feet is getting worse
- A new rash has appeared on your skin, in your mouth, or on your lips
- You have unusual bruising, or pinpoint red dots under the skin
- You feel too weak or unsteady to stand or walk safely
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Not sure whether this counts as an emergency?
Call the helpline. It is always better to check than to wait.
Which symptoms can wait until your next appointment?
Mild nausea that your prescribed anti-emetics are controlling, expected hair loss, and predictable tiredness after a treatment cycle do not need a same-day call.
If any symptom is new, worsening, or worrying you, call. Your team cannot act on what they do not know, and an unnecessary call is never a problem.
System by system: where does your symptom belong?
| System | Go to emergency now | Call your team today | Can wait for appointment |
|---|---|---|---|
| Fever / infection | Fever with shaking chills or rigors | Any temperature, even mild, without rigors | None — all fever needs contact |
| Bleeding | Bleeding not stopping; blood coughed up | Pink urine; blood in stool; unusual bruising | Minor bruising, not spreading |
| Breathing | Difficulty breathing; chest pain at rest | Breathlessness clearly worse than yesterday | Mild breathlessness, stable for days |
| Gut | Severe abdominal pain; cannot keep any fluid down | Persistent vomiting; unable to keep fluids down for hours | Mild nausea, controlled by prescribed medicine |
| Nervous system | Sudden confusion; new weakness one side; severe headache | Numbness or tingling in hands or feet, worsening | Mild tingling, unchanged for days |
| Skin / allergy | Swelling of face or throat; hives rapidly spreading | New rash anywhere; blistering in mouth | Mild dryness or itching, pre-existing |
| Typically starts | Any point — including between cycles | Any point in the treatment cycle | Predictable timing after each cycle |
Explore 69 more Blood Counts, Infection, Fever & Emergencies topics
Emergencies & Red Flags
- A Printable Emergency Action Card
- Bleeding That Will Not Stop
- Breathlessness: When It Is an Emergency
- Chemotherapy Emergencies: The Complete Red-Flag List
- Chest Pain During Chemotherapy
- Confusion, Drowsiness or Fits
- Emergency Contacts: Who to Call and When
- Fever: The Number One Emergency
- Going to a Different Hospital in an Emergency
- Leg Swelling and Calf Pain
- Not Passing Urine or Passing Very Little
- Problems With Your Port or Line
- Severe Mouth Pain Stopping Fluids
- Severe Pain That Is Not Controlled
- Swelling of the Face, Lips or Throat
- Uncontrolled Vomiting or Diarrhoea
- What to Keep Ready at Home for an Emergency
- When to Call the Helpline vs Go Straight In
Blood Transfusion & Donor Arrangement
Fever During Chemotherapy
- A Printable Fever Action Plan
- Can You Wait Until Morning With a Fever?
- Fever After the Course Has Finished
- Fever During Chemotherapy: What to Do Right Now
- Fever When You Cannot Reach Your Team
- Fever With Chills and Rigors
- Fever With No Other Symptoms
- Fever in a Child on Chemotherapy
- How Long Will You Be Admitted for a Fever?
- Is 99, 100 or 101 Degrees an Emergency?
- Preventing Infection to Avoid Fever Episodes
- What to Carry to Hospital With a Fever
- What to Tell the Hospital When You Call
- Why Fever Is Treated as an Emergency
HUB — Low Blood Counts, Infection and Fever During Chemotherapy
Infection Prevention at Home
Low Platelets & Bleeding
- A Printable Bleeding Red-Flag Card
- Arranging Platelet Donors
- Bleeding Gums and Nosebleeds
- Bruising Easily During Chemotherapy
- Dental Work and Procedures With Low Platelets
- Everyday Precautions With Low Platelets
- Foods That Are Said to Raise Platelets
- Low Platelets During Chemotherapy
- Painkillers to Avoid When Platelets Are Low
- Platelet Transfusion: What to Expect
- What Platelet Count Is Dangerous?
Low White Cells, Neutropenia & Infection
- A Printable Neutropenia Safety Card
- Avoiding Infection During the Low-Count Days
- Bone Pain After Growth Factor Injections
- Can You Go Out When Your Counts Are Low?
- Foods That Are Said to Raise White Cells
- Getting to Hospital Fast From a District
- Growth Factor Injections to Raise Your Counts
- How to Take and Record a Temperature Properly
- Low White Cell Count During Chemotherapy
- Neutropenia in Children on Chemotherapy
- Neutropenic Fever: A Medical Emergency
- Preventive Antibiotics During Chemotherapy
- Recovering Counts Between Cycles
- Should You Take Paracetamol for a Fever?
- Signs of Infection to Watch For
- Understanding Your Blood Count Report
- Visitors When Your Counts Are Low
- What Happens When You Go In With Neutropenic Fever?
- What Is Neutropenia?
- What Is an Absolute Neutrophil Count?
- What Temperature Means You Must Go to Hospital?
- Which Days Are You Most at Risk of Infection?
Vaccination During & After Chemotherapy
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Frequently asked questions
What is febrile neutropenia and why is it the most dangerous emergency on chemotherapy?
Febrile neutropenia is fever combined with a very low white blood cell count, leaving your body almost unable to fight infection. An infection that a healthy immune system would contain can spread to the bloodstream within hours. This is why fever with shaking chills means go to the emergency department immediately — not call first, not wait until morning. Your oncology team may have given you a card with your personal threshold for acting; keep it with you.
How do I know if my temperature counts as a fever on chemotherapy?
Your oncology team will give you a specific threshold — it is usually lower than what most people think of as a fever. Write it down and keep it somewhere visible. Buy a thermometer before your first cycle if you do not have one. If you feel hot or are shaking and cannot take your temperature, treat it as a fever and go to the emergency department without waiting.
I have more than one of these symptoms. Should I call my team or go straight to emergency?
If any go-now symptom is present — fever with rigors, difficulty breathing, bleeding that will not stop, or confusion — go to the emergency department without calling first. A phone call adds delay when minutes matter. If all your symptoms are in the call-today tier, call and describe them together. When you are unsure which tier applies, go to emergency.
Will going to the emergency department delay my chemotherapy?
Possibly, but that is a secondary concern. An untreated infection or bleed can end your treatment course entirely. Emergency doctors contact your oncology team directly, and the assessment helps your oncologist decide about your next cycle. Going in when you need to protects your treatment — it does not threaten it.
Chemotherapy Topics
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