Q: Fever returned to 38.1°C three days after Influenza B IV treatment, accompanied by thick yellow mucus. Should we see a doctor?

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 was diagnosed with Influenza B and received IV treatment along with a fever reducer on Saturday. The fever dropped to the low 37s and stayed under 37.5°C. However, today (Tuesday), they felt warm again, and their temperature is now 38.1°C. Is the fever returning? They also have symptoms that seem like sinusitis, with a lot of thick, yellow mucus when blowing their nose. Should we go to the doctor first thing tomorrow morning?

Answer:

It is completely understandable that you are worried since the fever dropped after the IV treatment on Saturday but has now gone back up to 38.1°C today.

Current Situation Overview:

• It has been about 3 days since the flu IV treatment.

• There is a reappearance of fever (38.1°C) along with yellow nasal discharge.

• Possibilities: The flu virus itself might still be running its course, or there is a possibility of a secondary complication such as bacterial sinusitis (a sinus infection).

What You Can Do at Home Now:

• Use a saline nasal spray or wash to help clear out the thick, sticky mucus.

• Ensure your child drinks plenty of fluids.

• Administer an appropriate over-the-counter fever reducer if your child is uncomfortable.

• Keep their upper body slightly elevated while sleeping to help with mucus drainage and breathing.

When to Visit the Pediatrician Tomorrow Morning:

If your child experiences any of the following, you should revisit the doctor tomorrow:

• Fever of 38.5°C or higher persists.

• Thick yellow mucus continues for more than 10 days or worsens.

• Your child complains of facial or forehead pain/pressure.

• They are unusually lethargic or refusing to eat/drink.

• They experience accompanying ear pain.

When to Go to the Emergency Room Tonight:

Watch carefully for these emergency warning signs:

• Difficulty breathing (e.g., chest retractions where the skin pulls in under the ribs, or wheezing).

• Extreme lethargy, limpness, or difficulty waking up.

• Bluish tint to the lips or face.

• No urination for more than 8 hours.

What to Discuss with Your Doctor:

When you visit the clinic, you may want to ask: "Is this a recurring fever from the flu, or a possible secondary bacterial complication?", "Are antibiotics necessary?", and "Is any additional testing (like an X-ray) needed?"

For tonight, please monitor closely for any of the emergency signals listed above. If none of those severe symptoms occur, observe their fever and nasal symptoms throughout the night and consult your pediatrician for an in-person evaluation tomorrow morning.

For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.

fevercoach.us

Apple App Store

Google Play