Elevated Body Temperature: Causes and Concerns in Family Medicine

Elevated body temperature?

Hello, doctor.
Since the outbreak of the pandemic in Taiwan, I have been regularly monitoring my temperature due to overlapping exposure with confirmed cases.
Previously, I only measured my forehead temperature at work, which mostly ranged from 36.6 to 36.8 degrees Celsius.
In mid-May, I experienced chest tightness and nausea, with ear temperature readings between 37.5 and 38 degrees Celsius.
I underwent testing, which returned negative results (and all my household members are healthy with no symptoms, so COVID-19 can be ruled out).
However, the chest tightness and nausea persisted for some time, and I constantly felt like there was something in my throat, but I did not have cough, headache, or other cold symptoms.
I visited a nearby family medicine clinic, where the doctor suspected hyperthyroidism and ordered blood tests, which returned normal values.

I had asthma around the age of 11 or 12, but I have not had any severe episodes since then; only during more serious colds do I experience bronchoconstriction and chest tightness.
Now, after about three months, I still regularly measure my ear temperature, which fluctuates between 37 and 37.5 degrees Celsius, occasionally dropping to 36.9 degrees Celsius.
My morning temperature is also around 36.9 to 37 degrees Celsius.
Does this indicate that I naturally have a higher body temperature? The family medicine doctor suspects autonomic nervous system dysregulation, but can autonomic nervous system dysregulation cause elevated body temperature? Additionally, I have recently experienced allergic reactions to foods that I previously had no allergies to (such as kiwi and peach).
Does this indicate that I am unwell?

fan nao, 20~29 year old female. Ask Date: 2021/08/20

Dr. Liao Yaopan reply Family Medicine

Hello, if infections or endocrine system abnormalities have been ruled out, it is recommended to consult with an allergist or immunologist for further evaluation.
Please note that online consultations are not equivalent to in-person visits and cannot provide diagnoses or treatment recommendations.
Changhua Hospital cares about your well-being.

Reply Date: 2021/08/20

More Info

Elevated body temperature can be a source of concern, especially in the context of ongoing health issues and the recent pandemic. Your experience of consistently measuring body temperatures between 37.0°C and 37.5°C, along with symptoms such as chest tightness and nausea, raises several important considerations.

Firstly, it is essential to understand that normal body temperature can vary from person to person. The average body temperature is typically cited as 37°C (98.6°F), but it can range from 36.1°C to 37.2°C (97°F to 99°F) in healthy individuals. Factors such as time of day, physical activity, and even emotional state can influence body temperature. Therefore, a body temperature consistently around 37.0°C to 37.5°C may not necessarily indicate a pathological condition, especially if you feel well otherwise.

The symptoms you describe—chest tightness, nausea, and a sensation of something in your throat—could be attributed to various causes. Since you have ruled out COVID-19 through testing and your family members are healthy, it is prudent to consider other potential explanations. The suspicion of hyperthyroidism (overactive thyroid) is valid, as this condition can lead to symptoms such as increased heart rate, anxiety, and heat intolerance. However, since your blood tests returned normal results, this possibility seems less likely.

Another consideration is autonomic nervous system dysregulation, which can manifest in various ways, including temperature regulation issues. The autonomic nervous system controls involuntary bodily functions, including heart rate, digestion, and temperature regulation. Dysregulation can lead to symptoms such as palpitations, gastrointestinal discomfort, and even changes in body temperature. While autonomic dysregulation may not directly cause elevated body temperature, it can contribute to sensations of discomfort and other symptoms you are experiencing.

Regarding your recent allergic reactions to foods that previously did not cause issues, this could indicate a change in your immune system's response. Allergies can develop at any time, and new sensitivities can emerge due to various factors, including stress, changes in diet, or underlying health conditions. It is advisable to consult with an allergist or your primary care physician to evaluate these reactions further.

In summary, while your body temperature readings may be slightly elevated, they do not necessarily indicate a serious health issue, especially in the absence of other significant symptoms. However, the persistent nature of your symptoms warrants further investigation. It would be beneficial to follow up with your healthcare provider, who may consider additional tests or referrals to specialists, such as an endocrinologist for thyroid evaluation or a cardiologist if your chest tightness persists.

In the meantime, maintaining a healthy lifestyle, managing stress, and monitoring your symptoms can be helpful. Keeping a detailed record of your symptoms, including any food reactions, can provide valuable information for your healthcare provider. If you experience any new or worsening symptoms, do not hesitate to seek medical attention promptly.

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