Q: My child has a high fever of 39.9°C that only drops with alternating medications, and the flu test was negative. Should we see a doctor today or wait?
- Myeongchan Kim, MD
- Jul 9
- 3 min read
Updated: Jul 21
Medically reviewed by Sang Hyun Ahn, MD
Content edited by Myeongchan Kim, MD
This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
Question:
My child has been having a persistent high fever. On the first night around 11 PM, the fever was 38.5°C, so I gave a fever reducer. The next morning at 7 AM, it was still 38.5°C, so I gave another dose. We went to the clinic, and the flu test came back negative. The doctor prescribed standard cold medication without antibiotics. Currently, my child doesn't have a cough or a runny nose.
However, since yesterday afternoon, the fever spiked to 39.9°C. It only goes down slightly when I alternate between two different fever reducers (cross-dosing). The doctor mentioned that the throat and nose condition could be causing the fever and that if it lasts for three days, pneumonia might be suspected.
Should I wait until tomorrow to see how it goes, or should I take my child to the doctor again today to get other tests done?
Answer:
Hello. It is completely understandable that you are very worried, as it is exhausting for both parents and the child when a high fever persists.
Based on your current situation:
• A high fever (38.5°C to 39.9°C) is continuing for a second day.
• The fever is stubborn and only drops when alternating medications.
• The flu test was negative, and no antibiotics were prescribed.
• The fever is present without other typical symptoms like a cough or runny nose.
It is highly recommended that you take your child to see the doctor again today for a re-evaluation.
Here is why:
A temperature of 39.9°C is quite high, and the fact that it is difficult to bring down even with alternating fever reducers warrants a medical review.
When a child has a high fever without other accompanying respiratory symptoms, additional diagnostics like blood or urine tests may be necessary to identify the exact cause (such as a urinary tract infection or other specific infections).
Since your doctor previously mentioned the possibility of pneumonia if the fever lasts for three days, it is much safer to have your child re-evaluated today rather than waiting.
Please go to the Emergency Room immediately if you notice any of the following danger signs:
• Difficulty breathing or chest retractions (the chest pulling in with each breath).
• Lethargy, confusion, or an inability to make eye contact or respond normally.
• Severe dehydration signs, such as refusing all fluids or not passing urine for 8 hours or more.
What you can do at home right now:
• Offer fluids frequently in small amounts (every 5-10 minutes) to prevent dehydration.
• Dress your child in light, breathable clothing.
• Keep a detailed log of your child's body temperature and the exact times the fever reducers are administered.
Rather than waiting until tomorrow, getting an in-person examination today will ensure your child receives the appropriate care. We hope your child recovers quickly!
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
