Q: My child has a persistent low-grade fever (37.5-37.7°C) while on antibiotics for an ulcerated throat. Should we see a doctor for an X-ray?
Updated: Sep 7
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:
Hello doctor. My child started having a fever of around 38.2°C last Friday. We visited the doctor, were told the throat was swollen, and my child took antibiotics from Friday to Monday. Since Sunday, the fever hasn't been high enough to require fever reducers, but a low-grade fever between 37.5°C and 37.7°C (sometimes dropping to around 37.2°C) has persisted.
During a follow-up visit yesterday, the doctor noted that my child's throat is ulcerated and prescribed three more days of antibiotics, which we are currently taking. I am feeling anxious and wondering if I should take my child back to the clinic tomorrow—perhaps for an X-ray—or if we should just wait until the medication is finished. Is it safe for this low-grade fever to continue?
Answer:
Hello! I understand it can be very worrying when a child's low-grade fever persists for nearly a week.
To summarize your child's current situation:
• A fever of 38.2°C started on Friday.
• Your child has been taking antibiotics for a swollen throat.
• A low-grade fever of 37.5-37.7°C has continued since Sunday.
• The throat was found to be ulcerated, and additional antibiotics were prescribed.
Temperatures between 37.5°C and 37.7°C fall perfectly into the low-grade fever range. Since your child is actively undergoing antibiotic treatment, this lingering temperature is likely part of a gradual recovery process. An ulcerated throat, in particular, takes time to fully heal.
It is generally safe to continue observing your child at home while they take the prescribed medication. However, you should visit your pediatrician for a re-evaluation tomorrow if any of the following happen:
• The fever spikes to 38.0°C or higher again.
• The throat pain becomes so severe that your child refuses to eat or drink.
• New symptoms develop, such as a persistent cough or difficulty breathing.
• Your child appears significantly more lethargic or generally more ill.
Regarding your question about an X-ray, this imaging is typically only necessary if there are symptoms that suggest a lower respiratory infection like pneumonia (such as a persistent cough, rapid breathing, or chest pain).
Please ensure your child finishes the entire course of antibiotics as prescribed, even if they start feeling better. Encourage plenty of hydration and sufficient rest. A low-grade fever is simply a normal, healthy response as the body continues to fight off the infection, so try not to worry too much. Be sure to seek an in-person evaluation if your child's condition worsens or does not improve after completing the medication.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
