Red-Flag Symptoms at Home During Radiation — When to Call Immediately

Call the emergency line immediately — don't wait for a scheduled appointment — for: sudden severe difficulty breathing or swallowing; chest pain; uncontrolled bleeding; sudden one-sided weakness, confusion, a severe headache unlike any before, or a seizure; fainting or collapse; or spreading redness, warmth and pus at the radiation site together with a high fever. These signs can point to a medical emergency whether or not they're related to the patient's cancer treatment, and every minute matters. Call CION's helpline at 1800-202-8726 or go straight to the nearest emergency room — whichever is faster for you. Don't try to manage any of these at home first.

Call your treatment centre the same day — not the emergency line — for: a fever your team hasn't cleared you to manage at home, a skin reaction worsening faster than expected, vomiting or diarrhoea that's stopped fluids staying down for several hours, new or worsening pain, signs of dehydration, or a missed dose of a prescribed medicine you're unsure how to handle. None of these are emergencies on their own, but they need a clinician's judgement the same day rather than waiting for your next scheduled review. Describe what you're seeing, when it started, and which day of treatment you're on.

Mild, expected side effects can usually be noted for your next visit rather than triggering an extra call: mild fatigue, mild skin redness or itching within the treatment field, small taste or appetite changes, or gradual hair loss limited to the treated area. Keep a simple symptom diary — what you noticed and when — so nothing gets forgotten by review day. If any of these mild symptoms suddenly worsen, spread beyond the treatment area, or come with a new symptom from the call-today or call-now lists, treat it by the more urgent category instead.

For a true emergency — chest pain, severe breathing trouble, uncontrolled bleeding, sudden weakness or a seizure — call an ambulance or go straight to the nearest emergency room; don't wait to reach a specific centre first. For everything on the call-today list, or if you're unsure which category applies, call CION's helpline at 1800-202-8726 and describe what you're seeing — the team will tell you whether to come in, get guidance over the phone, or watch and wait. Save this number in your phone before treatment starts, not after a symptom appears.

Treat it as the more urgent category and call — sorting a symptom perfectly isn't the goal, getting the right help is. If a symptom is new, sudden, or clearly worse than what you were told to expect, that uncertainty itself is a reason to call your care team today rather than wait it out. Describing exactly what you see — what, when it started, and how it's changed — lets a clinician judge it accurately even over the phone. You are not expected to diagnose anything yourself; this page is a starting sort, not a replacement for your care team's judgement.

Yes — completely. Care teams would always rather take a call about something that turns out to be minor than have a family wait out something serious out of worry about "bothering" anyone. Caretaking during radiation is exhausting, and second-guessing yourself on top of it isn't fair to you. There's no such thing as a wasted call about a patient's symptom. If you're tired, unsure, or simply want reassurance, that's reason enough to call — you don't need to be certain something is wrong before you pick up the phone.