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Immunotherapy Side Effects · Heart, Kidney, Muscle & Nerve Reactions
Chest Pain or Palpitations on Immunotherapy — Go Now
New chest pain or palpitations during immunotherapy can be the first sign of immune-related myocarditis — inflammation of the heart muscle triggered by an overactive immune response. NCCN and ASCO guidance on immune-related adverse events treats any new chest pain or palpitations on immunotherapy as a cardiac emergency until proven otherwise, because myocarditis can worsen within hours.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- One instruction, not a checklist — new chest pain or palpitations on immunotherapy means go to the emergency room now, not wait-and-watch.
- Say the words that matter — "I am on immunotherapy" tells the emergency team to test for immune-related myocarditis without delay.
- Rare, but time-critical — immune-related heart inflammation is uncommon, but it can worsen within hours if it isn't caught early.
- Ordinary explanations are ruled out at hospital, not at home — anxiety, caffeine or acidity are only safe conclusions once your heart has been checked.
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Read this first
Is It Ever Safe to Wait If You Have Chest Pain or Palpitations on Immunotherapy?
No. Chest pain or palpitations that start during immunotherapy are never safe to wait out, monitor overnight, or explain away yourself. They can be the first sign of immune-related myocarditis — heart inflammation caused by an overactive immune response — which can worsen within hours. The only safe action is to go to the nearest emergency room now and say you are on immunotherapy.
Go to the nearest emergency room now, or call an ambulance, if you have:
- New chest pain, pressure or tightness, of any severity
- A racing, pounding, fluttering or irregular heartbeat that is new or unexplained
- Breathlessness, dizziness or fainting alongside either symptom
- Unusual tiredness or muscle weakness together with chest pain or palpitations
There is no mild version of this symptom to wait out on immunotherapy — every one of the signs above is treated as urgent, without exception.
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Why it can't wait
Why Are Chest Pain and Palpitations Treated as an Emergency on Immunotherapy?
Immune-related myocarditis is a rare but serious reaction in which the same immune activation that helps treat the cancer also attacks the heart muscle. NCCN and ASCO guidelines list it among the most serious immune-related reactions precisely because early symptoms — mild chest discomfort, a few skipped or racing heartbeats — can look identical to anxiety, indigestion or ordinary treatment fatigue, while the underlying inflammation can progress rapidly.
This is why the guidance for this specific symptom is deliberately simple: it is not "wait and see if it gets worse," it is "go, and say you are on immunotherapy." Sorting out what actually caused it happens at the hospital, with tests — not at home, by comparing how you feel to how you felt yesterday.
Timing
When Does Immune-Related Myocarditis Typically Start?
According to NCCN and ASCO immune-related adverse event guidance, myocarditis is most likely to appear early in treatment, though it can occur at any point — including after a single infusion. Knowing the typical pattern helps you take a new symptom seriously rather than dismissing it as unrelated.
| Phase | What's typically happening |
|---|---|
| Typically starts | Most often within the first 3 months of starting immunotherapy, and especially within the first 6–12 weeks — though it can occur at any point during treatment, including after a single dose. |
| Early phase | Mild chest discomfort, a few skipped or racing heartbeats, or unusual fatigue — easy to dismiss as anxiety, indigestion or ordinary tiredness from treatment. |
| If ignored | Inflammation can spread through the heart muscle within hours to days, affecting how well it pumps and, in some cases, causing dangerous heart rhythm problems. |
At the emergency room
What Exactly Should You Tell the Emergency Doctor?
Say one sentence within the first minute: "I am on cancer immunotherapy and may have immune-related myocarditis." This single sentence changes how quickly the emergency team acts, because immune-related myocarditis is tested for and treated differently from a routine cardiac work-up.
- "I am on cancer immunotherapy and may have immune-related myocarditis" — say this before describing anything else.
- Name the exact symptom and when it started — chest pain, palpitations, breathlessness, dizziness — and whether it is constant or comes and goes.
- Give the name and contact details of your treating oncology team so the emergency department can coordinate directly with them.
- Mention any other immune-related reactions you've had during immunotherapy — this can affect how quickly steroids or other treatment are started.
You do not need to know the medical details yourself — saying you are on immunotherapy and asking for immune-related myocarditis to be checked is enough to put you on the right pathway immediately.
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What comes after you call
What Tests Are Needed to Check for Immune-Related Myocarditis?
Confirming or ruling out immune-related myocarditis needs blood tests and heart monitoring done urgently, not over several days. NCCN and ASCO guidance calls for troponin testing and an ECG within the first hour for anyone on immunotherapy presenting with new chest pain or palpitations, with further heart imaging if either result is abnormal.
- 1
Troponin blood test
A blood test that detects heart muscle damage — usually repeated within a few hours to check whether the level is rising.
- 2
ECG (electrocardiogram)
A quick, painless trace of your heart's electrical activity, done immediately to look for rhythm changes.
- 3
Echocardiogram
An ultrasound scan of the heart to check how well it is pumping and to look for signs of inflammation.
- 4
Cardiac MRI, if needed
Used in some cases to confirm inflammation of the heart muscle when the diagnosis is still unclear after initial tests.
- 5
Joint cardiology–oncology review
A cardiologist and your oncology team decide together on steroid treatment and whether immunotherapy needs to be paused, based on the results above.
Care during treatment
Rare Reactions Are Manageable When Caught Early
Patients who report new heart symptoms promptly are supported by the same multidisciplinary team throughout treatment.
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Common questions
Chest Pain, Palpitations and Immune-Related Myocarditis: Your Questions Answered
Is it ever safe to wait if I have chest pain or palpitations on immunotherapy?
No. Chest pain or palpitations that start during immunotherapy are never safe to wait out, monitor overnight, or explain away yourself. They can be the first sign of immune-related myocarditis, which can worsen within hours. The only safe response is to go to the nearest emergency room now and tell the staff you are on immunotherapy.
What tests are needed to check for immune-related myocarditis?
A troponin blood test and an ECG are done immediately to check for heart muscle damage and rhythm changes, usually within the first hour. If either is abnormal, an echocardiogram checks how well the heart is pumping, and a cardiac MRI may follow to confirm inflammation. A cardiologist and your oncology team then decide together on treatment.
What exactly should I tell the emergency doctor?
Say one sentence in the first minute: "I am on cancer immunotherapy and may have immune-related myocarditis." Then describe the exact symptom and when it started, and give the name and contact details of your treating oncology team so the emergency department can coordinate directly with them. You do not need to know the medical details yourself for this to work.
How common is immune-related myocarditis?
Immune-related myocarditis is one of the rarer reactions to checkpoint-inhibitor immunotherapy, occurring in a small proportion of patients according to NCCN and ASCO safety guidance. It is treated as a top-priority emergency precisely because it is uncommon enough to be missed and can progress quickly once it starts, not because it is common.
Could this just be anxiety, caffeine or indigestion instead of myocarditis?
It might be, but that conclusion can only be reached safely after a doctor has checked your heart with a troponin test and an ECG — not by comparing how you feel to how you felt yesterday. Anxiety, caffeine and indigestion are common causes of chest discomfort and palpitations in general, but on immunotherapy they are ruled out at the hospital, never assumed at home.
What happens after immune-related myocarditis is confirmed?
Treatment usually starts with high-dose steroids in hospital to calm the immune reaction, alongside close heart monitoring. Your immunotherapy is paused while this happens, and your cardiology and oncology teams jointly decide, once you have recovered, whether and how treatment can safely continue.