Unexplained Fever and Rapid Heartbeat: Causes and Insights

Fever of unknown origin, body temperature elevation?

Hello, last night after work, I suddenly felt warm, but it wasn't a fever, and my heart was racing.
Today, I am experiencing the same situation.
I would like to know what could be the cause of this, and whether it is a medical condition.
Thank you.

Jun, 10~19 year old female. Ask Date: 2020/07/31

Dr. Hou Yuchang reply Traditional Chinese Medicine

Hello, Mr.
Jun.
Due to the limited information you provided, it is difficult to give a precise answer.
In medical terms, a feeling of warmth is not a primary disease symptom and usually needs to be accompanied by other phenomena.
You mentioned that this occurs after returning home from work and is associated with a rapid heartbeat.
Since you did not specify any aggravating or alleviating factors or other accompanying symptoms, it is challenging to draw conclusions at this time.

From a Western medicine perspective, one might consider whether this is due to dehydration or electrolyte deficiency resulting from work, which has not yet been replenished.
This could lead to vasoconstriction and an increased heart rate, resulting in a slight feeling of warmth.
This condition can often be corrected with hydration and electrolyte replenishment, along with adequate rest, allowing the body to self-regulate back to normal.
However, if this occurs repeatedly, there is a chance that the body may not be able to adjust back.
Another possibility to consider is hyperactivity of the autonomic nervous system, which may arise from environmental factors causing initial discomfort, prompting the body to self-adjust to cope with these changes, or from medications that increase sympathetic nervous system activity (such as those that invigorate the body to relieve fatigue), resulting in an accelerated heartbeat and a buildup of energy leading to warmth.
This is a normal response.
However, if such symptoms occur repeatedly without changes in the environment, medication use, or physical discomfort, it may be advisable to consult a specialist in metabolic disorders or family medicine.
From a Traditional Chinese Medicine perspective, one might consider Yin deficiency or hyperactivity of Liver Yang.
Yin deficiency is similar to the previously mentioned dehydration and electrolyte deficiency but should also include symptoms such as dry mouth, difficulty quenching thirst, and hard stools.
It would require appropriate herbal remedies to nourish Yin and clear heat, along with a diet rich in hydrating fruits and vegetables, while avoiding warming tonics.
If it is hyperactivity of Liver Yang, it would be accompanied by symptoms such as insomnia, irritability, and tension, resembling the hyperactivity of the autonomic nervous system in Western medicine.
In this case, one would need to take herbs that clear the liver and reduce heat to help the body relax and self-adjust, again avoiding warming tonics.
These suggestions are for your reference.
Wishing you peace and health.

Sincerely,
Dr.
Hou Yu-Chang
Director, Department of Traditional Chinese Medicine
Taoyuan General Hospital, Ministry of Health and Welfare

Reply Date: 2020/07/31

More Info

Experiencing a sudden increase in body temperature and a rapid heartbeat can be concerning, especially if these symptoms appear without an obvious cause. Based on the information provided, it seems that you are experiencing a combination of unexplained fever-like sensations and tachycardia (rapid heartbeat).
Firstly, it's important to differentiate between a true fever and a sensation of warmth. A fever is typically defined as a body temperature above 100.4°F (38°C) and is often a sign of an underlying infection or inflammation. If your body temperature is elevated but not reaching this threshold, it may be a subjective feeling of warmth rather than a true fever. This can occur due to various factors, including stress, anxiety, or even hormonal changes.

The rapid heartbeat you are experiencing can be attributed to several potential causes. One common reason for an increased heart rate is the body's response to stress or anxiety. When you are under stress, your body releases adrenaline, which can lead to an increased heart rate and feelings of warmth. Additionally, physical exertion, such as working long hours or engaging in strenuous activities, can also elevate your heart rate temporarily.

Another possibility is that your symptoms could be related to autonomic nervous system dysregulation. The autonomic nervous system controls involuntary bodily functions, including heart rate and temperature regulation. If this system is out of balance, it can lead to symptoms such as palpitations, rapid heartbeat, and feelings of warmth or flushing.

In some cases, underlying medical conditions could be responsible for these symptoms. Conditions such as hyperthyroidism (an overactive thyroid), infections, or even certain types of arrhythmias (irregular heartbeats) can lead to an increased heart rate and sensations of warmth. If you have a history of heart issues or other medical conditions, it is essential to consider these factors.

Lifestyle factors can also play a significant role in your symptoms. For instance, excessive caffeine intake, dehydration, or lack of sleep can contribute to an increased heart rate and feelings of warmth. It is advisable to monitor your caffeine consumption and ensure you are adequately hydrated.

Given the complexity of your symptoms, it is essential to consult a healthcare professional for a thorough evaluation. They may recommend tests such as blood work, an electrocardiogram (ECG), or even a Holter monitor to assess your heart's rhythm over a more extended period. These tests can help rule out any underlying conditions that may require treatment.

In summary, while your symptoms of increased body temperature and rapid heartbeat can be attributed to various factors, including stress, lifestyle choices, or potential medical conditions, it is crucial to seek medical advice for a proper diagnosis and management plan. Keeping a record of your symptoms, including when they occur and any associated factors, can be helpful for your healthcare provider in determining the underlying cause.

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