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Which side effects need urgent attention?
CRS and ICANS are important complications to recognize, but their symptoms can overlap with other treatment effects or illness. Report what you notice rather than trying to identify the cause yourself.
CRS: fever and whole-body symptoms
CRS is a systemic inflammatory reaction. It may cause fever, chills, nausea or vomiting, headache, rash, a rapid heartbeat, low blood pressure, dizziness, or trouble breathing. The National Cancer Institute describes signs and symptoms including “fever, nausea, headache, rash, rapid heartbeat, low blood pressure, and trouble breathing.” Severe CRS can be life-threatening.
ICANS: changes in thinking, speech, or movement
ICANS is a neurological toxicity. Warning signs can include confusion or agitation, unusual sleepiness or difficulty waking, trouble speaking or understanding, tremors, loss of balance, and seizures. Tell the care team immediately about these changes and follow the response steps in your CAR T plan.
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What should you do when symptoms appear?
- Use your CAR T center’s instructions. Before leaving the treatment center, make sure the patient and caregiver know whom to call, including the after-hours number, and have the written emergency plan readily available.
- Contact the team promptly about concerning symptoms. Do not wait to see whether suspected CRS or ICANS goes away on its own. For severe or rapidly worsening symptoms, use the emergency response specified by the center.
- Share clear observations. If available, tell the team when the symptom began, what changed, and the measured temperature. A digital thermometer can help record a temperature for the call, but it cannot diagnose CRS or make home management safe.
- Follow the center’s advice about where to go. A 2019 NIH Clinical Center handout tells its clinical research participants to contact their medical team or go to a local emergency room for CRS symptoms at home. That handout is not universal guidance; your own center’s instructions govern.
The National Cancer Institute’s general cancer-treatment guidance identifies a temperature of 100.5°F (38°C) or higher as a fever to note. This guidance, described as approximately 2023, is not a CAR T-specific threshold. Use the fever threshold and escalation instructions provided by your treatment center instead.
How are CRS and ICANS treated?
These conditions require clinical assessment. Depending on the situation, clinicians may use tocilizumab and, when needed, steroids for CRS; supportive care may include IV fluids, oxygen, or blood-pressure support. These are clinician-directed treatments, not a list of medicines or steps to try at home. Do not start an over-the-counter medicine, supplement, or other treatment for suspected CRS or ICANS unless your care team instructs you to.
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What other problems should you report?
CAR T-cell therapy may also be associated with infection risk, low blood counts, infusion reactions, and abnormal electrolyte levels. Tell the team about new or worsening problems so clinicians can decide whether evaluation or treatment is needed. Do not assume a symptom is harmless because it does not match a CRS or ICANS warning sign.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What precautions should you follow after treatment?
Follow the monitoring schedule and activity instructions from your CAR T center, including any individualized precautions. The American Cancer Society describes close observation for several weeks and advises avoiding driving, heavy machinery, and other dangerous activities for at least eight weeks after treatment. Your center’s guidance should direct your care and activity decisions.
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