Immunotherapy side effects living
Informed by recognized medical guidance
Overview
Immunotherapy is a type of treatment that helps your body's immune system fight cancer and other diseases. While it works, it can also cause side effects, because the immune system becomes more active than usual. This article explains the side effects you may experience and offers practical ways to cope with them.
Key facts
- Immunotherapy side effects often feel like an overactive immune reaction, such as fatigue, rash, or flu-like symptoms.
- Side effects are not a sign that the treatment is or is not working.
- Many side effects can be controlled with medications, rest, and support from your healthcare team.
Yes. Side effects from immunotherapy are common, but most people do not experience all of them. The number and severity of side effects vary widely from person to person.
People receiving immunotherapy for cancer may develop these side effects. They can also happen to people treated with immunotherapy for certain autoimmune conditions. Your age, overall health, and type of immunotherapy affect what side effects you may have.
Symptoms
- Trouble breathing or shortness of breath that feels new
- Fever over 39°C (102°F) with shaking chills
- Severe headache with neck stiffness or sensitivity to light
- Difficulty speaking, weakness on one side, chest pain, or fainting
- Sudden swelling of the face, lips, tongue, or throat
- ⚠A skin rash that is painful, blistering, or spreading quickly
- ⚠Ongoing diarrhea or vomiting that prevents you from drinking enough fluids
- ⚠Cough with blood or new chest pain
- ⚠Yellowing of your skin or eyes
- ⚠Very low energy that stops you from getting out of bed
Common symptoms
- Tiredness or fatigue
- Skin rash, redness, or itching
- Fever, chills, or body aches
- Nausea, vomiting, or diarrhea
- Shortness of breath or a dry cough
- Joint pain or muscle pain
- Headaches or dizziness
Causes
Main causes
- Immunotherapy works by removing the 'brakes' on your immune system, allowing it to attack cancer cells. The same immune activity can also affect healthy tissue, causing inflammation and side effects.
- Different types of immunotherapy affect the body in different ways, so the side effects can vary.
- Side effects depend on your individual immune response and the dose of the treatment you receive.
Risk factors
- Having an autoimmune disease, such as rheumatoid arthritis or inflammatory bowel disease
- Being older or having other long-term conditions like diabetes or heart disease
- Taking certain types of immunotherapy that are known to cause more side effects
- Experiencing side effects early in your treatment
When to see a doctor
Diagnosis
Your healthcare team will diagnose immunotherapy side effects by listening to your symptoms, doing a physical exam, and reviewing blood and imaging tests. They may also ask you to describe how side effects affect your daily life.
Tests that may be done
- Blood tests to check your liver, kidneys, and thyroid
- Urine tests to check for infection or kidney problems
- Chest X-ray or CT scan to spot inflammation in your lungs
- Skin examination if you have a rash
What to expect at your appointment
Your care team will discuss what you are feeling and may adjust your treatment plan. They may refer you to a specialist, such as a dermatologist or lung specialist, for a specific side effect. Be honest about your symptoms so they can help you best.
Treatment
Treatment for immunotherapy side effects focuses on easing your symptoms and managing any inflammation while keeping your core treatment on track. The plan is made by your healthcare team and may change over time.
Self-care at home
- Get plenty of rest and take short naps if you need them.
- Use a broad-spectrum sunscreen and moisturise your skin with gentle products.
- Drink small amounts of water or clear fluids often to stay hydrated.
- Keep a diary of your symptoms, including when they happen and how severe they are.
- Try relaxation, deep breathing, or prayer to help yourself feel calm.
Medical treatments
Your healthcare team may prescribe medicines that reduce inflammation or calm the immune system. They may also adjust your immunotherapy schedule or give you extra fluids. Always take medicines exactly as prescribed. Ask your doctor or pharmacist if you have questions.
When is surgery considered?
Surgery is rarely needed for immunotherapy side effects. Very rarely, a severe complication, such as a bowel injury, may require an operation. Your care team will talk to you if this is ever a possibility.
Living with this condition
Make small changes to your daily routine to save energy. Plan activities for the times when you feel best. Ask for help with chores or errands when you need it, and keep your healthcare team informed about how you are coping.
Lifestyle tips
- Take gentle walks or do light stretching to keep your body moving.
- Try relaxation techniques like deep breathing or gentle yoga to lower stress.
- Stick to a regular sleep schedule and create a calm bedtime routine.
- Stay connected with family and friends, even on difficult days.
Diet and exercise
Eat a variety of healthy foods, including fruits, vegetables, whole grains, and protein. If you have nausea, choose bland foods and eat several small meals. Stay well hydrated. Light exercise like walking can lift your mood and energy, but listen to your body and rest if you feel unwell.
Mental health and emotional wellbeing
Dealing with side effects while facing a serious illness can be emotionally heavy. You may feel anxious, sad, or frustrated. These feelings are normal. Talking to a counsellor or chaplain, joining a support group, or confiding in a close friend can help you process your experiences.
Prevention
You cannot completely prevent side effects, but you can take steps to catch them early. Report symptoms as soon as they appear, keep your appointments, and follow any monitoring plan your doctor recommends.
Vaccines
Talk to your doctor before having any vaccine during immunotherapy. Some vaccines, especially live vaccines, are not safe while your immune system is altered. Your doctor will guide you on what is recommended.
Screening programmes
Your care team may schedule regular blood tests to screen for early signs of side effects, such as changes in your liver or thyroid. This helps identify problems before they become severe.
Complications
If left untreated
- Inflammation of internal organs, such as the lungs, liver, or colon, which can become severe without treatment
- Serious infections due to an unbalanced immune system
- Hormone imbalances that affect your energy, blood pressure, or blood sugar
- Dehydration or poor nutrition from ongoing nausea, vomiting, or diarrhea
Long-term outlook
The outlook for immunotherapy side effects is generally positive. Many side effects are temporary and improve with the right care. Even serious side effects can often be controlled so you can continue treatment. Your healthcare team is there to support you, and many people manage these side effects successfully.
Find support
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
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Sources and guidance
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 31, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.