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Immunotherapy Side Effects · Lung & Breathing Reactions
Tuberculosis Risk and Immunotherapy in India — Screening, Symptoms and When to Call
India carries one of the highest tuberculosis burdens in the world, and checkpoint-inhibitor immunotherapy — especially once steroids are needed to treat a side effect such as pneumonitis — can allow a past or latent TB infection to reactivate. WHO and NTEP-aligned oncology practice in India screens for TB before treatment starts and treats any persistent cough, fever or weight loss during immunotherapy as needing same-day assessment.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- TB is screened before you start — a chest X-ray and history check TB risk before immunotherapy begins, for most Indian patients.
- Highest risk after steroids — TB reactivation is most often reported once steroids treat an unrelated immune-related side effect.
- Looks like pneumonitis at first — cough, fever and breathlessness overlap, so both are tested for together, never assumed.
- Immunotherapy often continues — with anti-TB treatment coordinated by your tumour board and a TB physician together.
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Symptom triage
Is There a TB Reactivation Risk With Immunotherapy in India?
Yes. India's high tuberculosis burden means checkpoint-inhibitor immunotherapy carries a genuine, documented risk of TB reactivation, particularly once steroids are used to treat an immune-related side effect such as pneumonitis or colitis. This is why oncology teams in India screen for TB before starting immunotherapy and stay alert to it throughout treatment.
Call the CION helpline the same day, or go to the ER if breathless at rest, if you notice:
- A cough lasting more than two weeks, or any blood-streaked sputum
- Fever that doesn't settle, especially with night sweats
- Unexplained weight loss alongside these symptoms
- Any new breathlessness — treat it as urgent regardless of the cause
Know the difference
How Is TB Reactivation Told Apart From Immune Pneumonitis?
Both can cause cough, fever and breathlessness, so they cannot be told apart by symptoms alone. TB tends to build gradually over weeks with night sweats and weight loss, while immune pneumonitis develops faster and responds to steroids rather than anti-TB treatment — which is exactly why both are tested for together before either is treated.
| Feature | TB reactivation | Immune pneumonitis |
|---|---|---|
| Typical build-up | Gradual, often over 2-4 weeks | Faster, often days to a couple of weeks |
| Fever / night sweats | Common | Uncommon; occasional low-grade fever |
| Weight loss | Common, gradual | Uncommon |
| Blood-streaked sputum | Can occur | Rare |
| Confirming test | Sputum test / GeneXpert plus chest imaging | CT pattern plus ruling out infection |
| Response to steroids alone | Can allow TB to worsen if given unrecognised | Usually improves |
Because steroids are the standard first treatment for pneumonitis yet can allow an unrecognised TB infection to worsen, your care team tests for both before treating either — this is not something to try to distinguish at home.
Did you know?
India accounts for roughly a quarter of all tuberculosis cases reported worldwide each year (WHO Global TB Report) — which is why TB is screened for specifically before immunotherapy starts here, in a way it often isn't in lower-burden countries.
Before you start
Is TB Screening Done Before Starting Immunotherapy in India?
Yes. Indian oncology teams typically screen for tuberculosis before starting checkpoint-inhibitor immunotherapy, especially if you have a past TB history, close contact with someone who had TB, or come from a high-prevalence area — which, in India, is most of the country. Screening usually starts with a clinical history and a chest X-ray; some patients also need an IGRA blood test.
If latent TB is found, your team may discuss preventive anti-TB treatment before or alongside immunotherapy, coordinated with a pulmonologist or TB physician rather than decided by the oncology team alone. This is a precaution, not a reason immunotherapy is refused — most patients who screen positive for latent TB still go on to start treatment on schedule, with closer monitoring built in.
Timing matters
When Does TB Reactivation Typically Appear During Immunotherapy?
There is no single fixed window. Most reported cases appear after steroids have been started for an unrelated immune-related side effect, rather than from immunotherapy alone, and the timing can range from a few weeks to several months into treatment — this unpredictability is exactly why any persistent symptom is reported the same day it's noticed.
| Stage | What's typically happening |
|---|---|
| Typically starts | Most often once steroids are used for a separate immune-related side effect — commonly weeks to a few months after that steroid course begins, though timing varies widely. |
| Early phase | Vague constitutional symptoms — mild fever, tiredness, or a cough that doesn't seem serious — easy to put down to the cancer or the immunotherapy itself. |
| If unreported | Can progress over weeks to a clearer TB picture: persistent cough, drenching night sweats and noticeable weight loss. |
There is no safe home-management step for a persistent cough, unexplained fever or weight loss during immunotherapy. The correct response is always same-day medical assessment, or the ER for the emergency signs listed above — never waiting to see if it settles on its own.
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What comes after you report a symptom
How TB Is Diagnosed and Managed Alongside Immunotherapy
Reporting a persistent cough, fever or weight loss early leads to a structured pathway, not guesswork — TB, infection and pneumonitis are all checked together rather than assumed. Our companion page, Immune Pneumonitis: Cough and Breathlessness on Immunotherapy, covers the lung-inflammation side of this picture in full.
- 1
Same-day clinical review
Your oncology team checks oxygen saturation, examines you, and reviews your TB history, past contacts and any recent steroid use for another immune-related side effect.
- 2
Sputum testing and chest imaging
A sputum sample or GeneXpert test, plus a chest X-ray or CT scan, looks specifically for TB alongside the checks already used to rule out infection and pneumonitis.
- 3
Starting anti-TB treatment if confirmed
If TB is confirmed, a multidrug anti-TB regimen (ATT) following national treatment guidelines is started under a pulmonologist or TB physician's care.
- 4
Coordinating ATT with your other medicines
Because some anti-TB drugs affect how the liver processes other medicines, including steroids, your oncology and TB teams coordinate dosing and timing together, with blood tests to check things stay in a safe range.
- 5
A joint decision on immunotherapy
Your tumour board and TB physician decide together whether immunotherapy continues alongside ATT, pauses temporarily, or is adjusted, based on how unwell you are and how both treatments are progressing.
Care during treatment
Immune Reactions Are Manageable When Caught Early
Patients who report persistent symptoms promptly are supported by the same multidisciplinary team throughout treatment.
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Common questions
TB and Immunotherapy in India: Your Questions Answered
Is there a TB reactivation risk with immunotherapy in India?
Yes. India's high tuberculosis burden means checkpoint-inhibitor immunotherapy carries a genuine, documented risk of TB reactivation, particularly once steroids are used to treat an immune-related side effect such as pneumonitis or colitis. This is not a reason to avoid immunotherapy — it's a reason your oncology team screens for TB before you start and stays alert to it throughout treatment, especially if you have a past TB history or come from a high-prevalence area, which in India is most of the country.
Is TB screening done before starting immunotherapy in India?
Yes. Indian oncology teams typically screen for tuberculosis before starting checkpoint-inhibitor immunotherapy, especially if you have a past TB history, close contact with someone who had TB, or come from a high-prevalence area. Screening usually starts with a clinical history and a chest X-ray; some patients also need an IGRA blood test. If latent TB is found, your team may discuss preventive anti-TB treatment before or alongside immunotherapy, coordinated with a pulmonologist or TB physician.
How is TB reactivation told apart from immune pneumonitis?
Both can cause cough, fever and breathlessness, so they cannot be told apart by symptoms alone. TB more often builds gradually over weeks with night sweats, unexplained weight loss and sometimes blood-streaked sputum, while immune pneumonitis tends to develop faster and responds to steroids rather than anti-TB treatment. Your care team confirms which one it is using a sputum test or GeneXpert alongside chest imaging, because giving steroids for pneumonitis without ruling out TB first can allow an unrecognised TB infection to worsen.
When does TB reactivation typically appear during immunotherapy?
There is no single fixed window — most reported cases appear after steroids have been started for an unrelated immune-related side effect, rather than from immunotherapy alone, and this can happen anywhere from a few weeks to several months into treatment. The early phase is often vague — mild fever, tiredness, or a cough that doesn't seem serious — which is exactly why any persistent respiratory or constitutional symptom during immunotherapy is reported the same day rather than watched for a few weeks.
Can immunotherapy continue if TB is diagnosed during treatment?
Often, yes, once anti-TB treatment (ATT) is underway and you are clinically stable, but this is an individual decision made jointly by your tumour board and TB physician. Factors considered include how unwell you were at diagnosis, how your cancer is responding, and how well the ATT regimen and your immunotherapy schedule can be coordinated together. Some patients continue immunotherapy alongside ATT under closer monitoring; others need a temporary pause — there is no single answer that fits everyone.
Do anti-TB drugs interact with immunotherapy or steroids?
Some anti-TB medicines can change how the liver processes other drugs you're taking, including steroids used for immune-related side effects, so dose adjustments are sometimes needed. This is one of the main reasons ATT for a patient already on immunotherapy is managed jointly by an oncologist and a TB physician rather than by either alone, with blood tests used to check liver function and drug levels are staying in a safe range through treatment.