Clinical safety
Use your own team’s instructions first
Use the contact number and urgent-care advice your team gave you for new or worsening symptoms. If you are having systemic anti-cancer treatment, use the 24-hour number on your treatment alert card. Call 999 for a life-threatening emergency.
Know which immunotherapy you have received before judging a symptom
Checkpoint inhibitors can cause inflammation in many organs, sometimes after treatment ends. CAR-T and other immunotherapies have different safety plans.
Your immunotherapy safety record
Show this to any clinician who assesses a new symptom.
- Record the exact drug or therapy, first and most recent treatment dates and treating hospital.
- Carry the alert card or information supplied by the team.
- Save the 24-hour number and the instructions for symptoms between visits.
- Note new bowel, breathing, skin, eye, hormone, liver, kidney, muscle, joint or neurological changes.
- Record when a change started and how it affects eating, drinking, sleep, movement or normal tasks.
- Tell other clinicians and pharmacists that you have received immunotherapy, even if treatment has finished.
- Do not start steroids or change regular medicines unless an appropriate clinician advises it.
Ask before leaving the treatment unit
The team should make urgency and ownership explicit.
- Which type of immunotherapy am I having and which safety risks belong to it?
- Which mild-looking symptoms still require an immediate call?
- How long after the last dose should I continue to report new symptoms?
- What should I tell an emergency department, GP or dentist?
- If treatment is paused for a side effect, how will recovery and future treatment be reviewed?
Put the treatment first in the sentence
This helps another service recognise the context.
“I have received a checkpoint inhibitor for cancer, most recently three weeks ago. I now have new diarrhoea and abdominal pain, and my treatment team told me to report new symptoms straight away.”
Recognise immune side effects before they become severe
Cancer immunotherapy includes treatments that help the immune system act against cancer. Checkpoint inhibitors can also make the immune system inflame healthy organs, sometimes during treatment and sometimes after it has finished.
Immune-related side effects can affect skin, bowel, liver, lungs, hormone glands, kidneys, nerves, muscles, eyes and other organs. They may begin as an ordinary-looking change, such as diarrhoea, cough, rash, unusual fatigue, headache or thirst. What makes the change important is that it is new, persistent or worsening after immunotherapy. Early reporting allows the treating team to decide whether tests and treatment are needed.
Keep the immunotherapy alert card with you and show it to any clinician, dentist or emergency service. Tell them the medicine name and when it was last given, even months later. Management can involve pausing immunotherapy and using treatment to calm inflammation, but those decisions need specialist oversight. Never self-start leftover steroids or stop prescribed steroids abruptly.
Response scans can be complicated because immune activity can alter appearances. Let the oncology team interpret changes alongside symptoms and serial imaging. Ask what the next scan is intended to decide rather than trying to judge success from one phrase in a report. Side effects and treatment response are separate questions: having no side effects does not mean treatment is ineffective, and severe side effects do not prove it is working.
A practical way through it
Use the parts that fit your situation and leave the rest.
- Record the exact medicineKeep the immunotherapy name, schedule, treating hospital, 24-hour number and first treatment date with your alert card and phone contacts.
- Know your baselineBefore treatment, note usual bowel frequency, breathing, skin, energy, vision, thirst and urine pattern so a meaningful new change is easier to describe.
- Call about early changesReport new diarrhoea, abdominal pain, cough, breathlessness, rash, weakness, headache, confusion, visual change or unusual thirst using the route your unit supplied.
- Tell every clinicianMention current or previous immunotherapy before treatment by another service, including urgent care, because it changes the causes they need to consider.
- Use steroids safelyIf steroids are prescribed, follow the dose and reduction plan exactly and contact the team about missed doses, vomiting, infection concerns or worsening symptoms.
- Keep monitoring after treatmentAsk how long delayed immune effects remain possible and retain the alert information and contact route for that period.
What this can look like
When a mild cough is new
Two weeks after an infusion, Chris develops a dry cough and feels slightly more breathless on stairs. It seems too minor for an emergency, so Chris plans to mention it next month.
A useful response
Call the immunotherapy or 24-hour oncology team the same day and describe the change from normal.
Give the treatment name, last dose and any temperature or other symptoms.
Follow the team's assessment instructions and call 999 if breathing becomes severe or rapidly worsens.
What immunotherapy means
- Not every cancer or person is suitable, and response cannot be predicted with certainty.
- It is distinct from chemotherapy even when treatments are combined.
Monitoring treatment
- Blood tests, symptom reviews and sometimes scans monitor treatment and organ function.
- Carry the alert card and tell every clinician you have had immunotherapy.
A manageable next step
What you could do now
- Put the 24-hour number and alert card where they stay accessible.
- Tell family which new symptoms require a call.
- Mention past immunotherapy whenever you seek medical care.
Checked sources
Read the original guidance
We summarise carefully and link to the source so you can check the full, most current information. Sources were checked 9 September 2026.