top of page
Search

Q: My child's basal body temperature has increased after a cold. Is this normal and should we get tests done?

  • Myeongchan Kim
  • May 28
  • 2 min read

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's normal basal body temperature used to be around 36.8-36.9°C. However, after recently catching a cold and having a fever, their basal temperature has stayed slightly elevated at 37.0-37.4°C even after recovering. In the evenings, it occasionally reaches 37.5-37.7°C. Is it possible for a child's basal body temperature to increase like this? I am a bit worried about these occasional low-grade fevers and am wondering if we should get a blood test or an X-ray. My child currently has no cough, but there is still a slightly runny nose.


Answer:

It is completely understandable to be concerned about changes in your child's basal body temperature. In fact, it is quite common for a child's temperature pattern to change temporarily after recovering from a cold.


Normal Temperature Ranges:

  • Morning basal temperature: 36.5°C to 37.2°C

  • Afternoon/Evening: Up to 37.5°C is still considered within the normal range

  • After physical activity or meals: Temporary increases are expected and normal


Reasons for Temperature Changes After a Cold:

  1. The immune system is still in the process of recovering.

  2. There may be some mild, lingering inflammation.

  3. The body's temperature-regulating center may have been temporarily reset by the recent illness.

  4. Environmental factors, such as seasonal changes or indoor room temperature, can also play a role.


What to Observe:

Instead of focusing solely on the numbers on the thermometer, pay close attention to your child's overall condition. Consider the following:

  • Is your child eating and playing as usual?

  • Do they seem lethargic, fussy, or uncomfortable when their temperature reaches 37.5°C?

  • Are their sleep patterns normal?


When to See a Doctor:

You should seek an in-person medical evaluation if you notice any of the following warning signs:

  • A fever of 38°C or higher develops and persists.

  • The child becomes extremely lethargic or lacks energy.

  • There is a significant loss of appetite or a refusal to drink fluids.

  • The low-grade fever continues for more than 2 weeks.

  • There is noticeable weight loss or a lack of expected growth.


Given the current situation, where your child only has a mild runny nose and no cough, I recommend simply observing them at home for another 1 to 2 weeks. A child's overall condition and behavior are much more important clinical indicators than minor temperature fluctuations. To get an accurate understanding of their true temperature pattern, try to measure it at consistent times and under the same conditions each day. If the low-grade fever persists beyond two weeks, or if you notice any new or worsening symptoms, please consult your pediatrician for a thorough evaluation.



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








 
 
bottom of page