Fever in a Child on Chemotherapy — What to Do Right Now

Your oncology team will have given you a specific number to watch for, and that is the one to follow. What matters most is this: if your child feels feverish to you, or has any reading that is clearly above their normal, treat it as an emergency rather than waiting for the reading to go higher. During chemotherapy, acting early is always safer than waiting at home. If you are unsure, call your team immediately rather than deciding alone.

No. Paracetamol lowers the fever reading but does not treat the infection underneath it. Your child may seem more comfortable for a few hours while the infection continues to develop — and this is one of the most common reasons families arrive at hospital later than they should. A fever that settles with paracetamol during chemotherapy still needs assessment today. The medicine is not the same as being safe.

Tell triage your child is on chemotherapy and has a fever — say this before anything else. Most hospitals have a specific protocol for this, and your child should be seen quickly rather than waiting in a general queue. The team will take blood tests to check the white blood cell count and look for signs of infection. Depending on the results, your child may need to stay in and be monitored closely. Bring your oncology team's contact details so the emergency doctor can speak to them directly.

The period of lowest white blood cell count typically falls in the days following a chemotherapy cycle, though the exact timing depends on which medicines your child is receiving. Your oncology team can tell you when the low point is expected in your child's specific treatment plan. Counts usually recover as the next cycle approaches, but they can vary from cycle to cycle. Your team may check blood counts regularly to track this — those results tell you when the highest-risk window is.