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Radiation Therapy — Emergency Symptoms
Radiation Emergencies — The Symptoms That Need Immediate Care
If you or someone you're caring for has a high fever with chills, sudden breathing trouble, heavy bleeding, confusion or any red flag below during or after radiation therapy, treat it as a genuine emergency now. This page is CION's single guide to which symptoms need immediate care, where to go, and what to carry.
Medically reviewed by Dr. Gangadhar Vajrala, Radiation Oncologist, MBBS · MD (Radiation Oncology) · MPH · Last reviewed August 2026
- Know the red flags fast — fever with chills, breathlessness, heavy bleeding, confusion or new weakness are emergencies, not side effects to wait out.
- Call first, act now — our helpline is answered around the clock; if you can't reach us at once, go straight to the nearest emergency department.
- Where to go — the nearest emergency department is always right, even if it isn't where your radiotherapy is delivered; we coordinate with your team from there.
- What to carry — your treatment summary and your radiation oncologist's number save the ER team time when minutes matter.
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Act Now, Not Later
Which Symptoms During Radiation Therapy Are True Emergencies?
A true emergency is any of these: a fever of 100.4°F (38°C) or higher with chills, sudden trouble breathing or chest pain, heavy or uncontrolled bleeding, sudden confusion or a severe headache, new leg weakness or loss of bladder control, or being unable to keep any fluids down. Any one of these means call now — don't wait for your next appointment.
If you or someone you're caring for has any of these symptoms right now, do not wait for a scheduled appointment and do not try a home remedy.
Call our helpline now: 1800 202 8726 — or go straight to the nearest emergency department.
Most side effects of radiation therapy are expected and manageable. The table below draws the line between what to simply mention at your next visit and what needs care right now.
| What you're noticing | Usually manageable — mention at your next visit | Emergency — call now or go to the ER |
|---|---|---|
| Skin at the treatment site | Redness, dryness, mild itching or peeling | Skin breaking open, spreading redness, pus or fever |
| Tiredness | Ongoing fatigue that builds through treatment | Sudden severe weakness, fainting or feeling unable to stay awake |
| Nausea or appetite | Mild nausea, some days better than others | Cannot keep any fluids down for 24 hours; signs of dehydration |
| Breathing | Occasional mild cough | Sudden severe shortness of breath or chest pain |
| Temperature | Feeling warm without chills | Fever of 100.4°F (38°C) or higher with chills |
| Bleeding | Minor spotting from a treated area | Heavy or uncontrolled bleeding from any site |
| Bladder or bowel | Mild urgency or frequency changes | Sudden loss of bladder or bowel control, or inability to pass urine |
| Neurological | Mild tiredness or a dull headache | Sudden confusion, seizure, one-sided weakness, or a severe headache unlike any before |
This list follows general oncology emergency-symptom guidance (NCCN/ASTRO patient-safety materials) and is not exhaustive. When in doubt, call and describe exactly what you're noticing — our team will tell you how urgently it needs to be seen.
Did you know?
For patients whose radiation field includes bone-marrow-rich areas, blood counts can drop enough that an ordinary fever becomes a genuine infection risk. That is exactly why NCCN and ASTRO patient-safety guidance treats fever with chills as an emergency, not a symptom to watch and wait on.
Don't Overthink the Location
Where Should You Go for a Radiation Therapy Emergency?
Go to the nearest emergency department — it does not need to be where your radiotherapy is delivered. Call our 24/7 helpline on the way if you can, or the moment you arrive, so we can coordinate with your treating team. If you can't reach us immediately, go straight to the ER anyway; don't wait for a callback.
Your radiotherapy itself is delivered at an NABH-accredited partner centre, and CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout — but in a true emergency, distance to the right facility matters more than which facility. Local emergency teams can stabilise you and reach your radiation oncologist for the details they need. If you can't travel safely on your own, call 108 for an ambulance.
Save the ER Team Time
What Should You Carry to the Emergency Room?
Carry your radiation treatment summary, a written list of what you're currently taking, your radiation oncologist's contact number, your ID and insurance or Aarogyasri card, and a family member or caretaker if one is available. These few items let the emergency team treat you faster and coordinate with your oncology team sooner.
- Treatment summary or discharge letter — states your diagnosis, treatment site and how many sessions you've had.
- A written list of what you're currently taking — medicines, supplements, anything recent.
- Your radiation oncologist's contact number — so the ER team can call for details fast.
- ID and insurance or Aarogyasri/CGHS/ESI card — speeds up admission.
- A family member or caretaker — someone who can answer questions if you can't.
Keep a copy of this list in your phone or wallet, not just at home, so it travels with you.
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Medical Oncologist
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Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
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Not Sure If It's an Emergency? Call and Ask
Our team reviews urgent symptoms fast and coordinates your care at an NABH-accredited partner centre. Free first consultation, no commitment to proceed.
Why Immediate Care Matters
Why These Symptoms Need Immediate Attention During Radiation Therapy
Radiation therapy can temporarily affect blood counts, the treated tissue, and the body's normal defences, depending on where and how much of the body is treated. That is why a symptom that would be minor for someone else — a moderate fever, for instance — can signal a genuine infection risk during treatment. NCCN and ASTRO patient-safety guidance both treat fever with chills, severe bleeding, breathing difficulty and new neurological symptoms as same-day concerns, not next-appointment ones.
This is not about causing alarm over ordinary side effects — most of what radiation therapy causes is expected and your care team will tell you what's normal for your specific treatment. This page exists for the smaller set of symptoms where minutes genuinely matter. For the full picture of what radiation therapy involves day-to-day, see our Radiation Therapy at CION Cancer Clinics guide.
From Symptom to Care
What Happens When You Call or Arrive
The sequence below is designed to move fast — whichever step you can reach first is the right one to take.
Call the helpline or go straight to the ER
Whichever you can do first. Don't wait for a callback if the emergency department is closer and faster.
Brief triage over the phone
Our team asks what you're noticing and when it started, and tells you plainly how urgently it needs to be seen.
Emergency department assessment
Local emergency teams stabilise you first — that's true wherever you are, and it's the right first step.
We coordinate with your oncology team
Sharing your treatment details with the ER and your radiation oncologist, so nothing about your case gets missed.
Follow-up review
Once you're stable, your treatment plan is reviewed and adjusted if needed, at your NABH-accredited partner centre.
Free second opinion
Get a Second Opinion on an Urgent Symptom
Take the First Step
Ask Us Before It Becomes Urgent
Every case at CION is reviewed by a team, not one doctor's opinion, and radiotherapy is coordinated at an NABH-accredited partner centre. Free first consultation.
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Common questions
Radiation Therapy Emergencies: Your Questions Answered
Which symptoms during radiation therapy are true emergencies?
Treat these as emergencies: a fever of 100.4°F (38°C) or higher with chills, sudden trouble breathing or chest pain, heavy or uncontrolled bleeding from any site, sudden confusion or a severe headache unlike any before, new leg weakness, numbness or loss of bladder or bowel control, and being unable to keep any fluids down for 24 hours. Any one of these needs immediate care, not a wait for your next scheduled appointment. Most other side effects — mild skin redness, ongoing tiredness, occasional nausea — are expected and manageable; mention those to your care team rather than treating them as emergencies.
Where should I go if I think this is an emergency?
Go to the nearest emergency department — it does not need to be where your radiotherapy is delivered. Call our 24/7 helpline on the way if you can, or as soon as you arrive, so we can coordinate with your treating team and share your treatment details with the emergency staff. If you can't reach us immediately, go to the ER anyway; local emergency teams can stabilise you and reach your radiation oncologist for the specifics they need. If you can't travel safely on your own, call 108 for an ambulance.
What should I carry to the emergency room?
Carry your radiation treatment summary or discharge letter, a written list of what you're currently taking, your radiation oncologist's contact number, your ID and insurance or Aarogyasri/CGHS/ESI card, and bring a family member or caretaker if one is available. These few items let the emergency team treat you faster and let them reach your oncology team sooner for anything specific to your treatment. Keep a copy of this list in your phone or wallet, not just at home, so it travels with you.
Should I call CION's helpline or go straight to the ER?
If it's a true emergency — fever with chills, breathing trouble, heavy bleeding, confusion, or the other red flags on this page — go straight to the nearest emergency department; don't wait for a callback. Call our helpline on the way, or the moment you arrive, so we can coordinate with the ER and your radiation oncology team. If you're unsure whether something counts as an emergency, call us first and describe exactly what you're noticing — we'll tell you how urgently it needs to be seen.
Is a mild skin reaction or ongoing tiredness during radiation therapy an emergency?
Usually not. Redness, dryness, itching or peeling at the treatment site, and ongoing tiredness that builds through a course of treatment, are expected and generally manageable — mention them to your care team at your next visit rather than treating them as an emergency. They become urgent only if the skin breaks open with spreading redness, pus or fever, or if weakness becomes sudden and severe enough that you feel faint. When in doubt about which category something falls into, call us and describe it.
Does CION run the emergency department or operate the radiation machine?
No. CION Cancer Clinics does not own or operate a linear accelerator or any radiotherapy machine, is not itself NABH-accredited, and does not run emergency departments. Your radiotherapy is delivered at an NABH-accredited partner centre, while CION coordinates your treatment plan, your oncology team and your care throughout — including reaching your radiation oncologist from whichever emergency department you go to.
This page is general health information about recognising emergency symptoms during and after radiation therapy. It is not a diagnosis and cannot replace urgent assessment of your own symptoms and medical history. If you have any of the warning signs described above, treat them as an emergency now — call our helpline or go to the nearest emergency department. Radiotherapy is delivered at NABH-accredited partner centres; CION Cancer Clinics coordinates your treatment plan, your oncology team and your care throughout.