Fever After Diagnosis: Post-Infection Symptoms

Fever after diagnosis?

In the first three days after diagnosis, I experienced a fever of 38.5°C.
After that, my daytime temperature was around 37.2-37.5°C, but as the sun began to set, I felt my temperature rise to 38.5°C, which lasted for about 3-4 hours before it decreased, accompanied by headaches.
After the diagnosis, I have been taking COVID-19 treatment No.
1, three packets daily, and so far, I have used nine packets.
Thank you.

Bai Yang, 60~69 year old female. Ask Date: 2022/10/06

Dr. Liao Zhongxin reply Internal Medicine

1.
When infected with COVID-19, there may also be infections in other areas, such as the upper respiratory tract, urinary tract, and wound infections.
Therefore, please check for any abnormal signs in other areas as well.
2.
Body temperature throughout the day is typically lower in the morning and higher in the evening, around 7 to 8 PM.
In addition to taking medication, remember to stay adequately hydrated.

Reply Date: 2022/10/06

More Info

Experiencing fever after a diagnosis, particularly following a viral infection like COVID-19, can be concerning and confusing. The symptoms you describe—persistent fever that fluctuates throughout the day, particularly rising in the evening, along with headaches—are not uncommon in the context of post-infection recovery.
Firstly, it’s important to understand that fever is a natural response of the body to infection. It indicates that the immune system is actively fighting off pathogens. In the case of COVID-19, many patients report a range of symptoms that can persist even after the acute phase of the illness has resolved. This phenomenon is sometimes referred to as "post-viral syndrome" or "long COVID," where individuals experience lingering symptoms that can include fatigue, fever, headaches, and other systemic issues.

The pattern of your fever—rising in the evening and accompanied by headaches—could be attributed to several factors:
1. Immune Response: After an infection, your immune system may still be active, leading to intermittent fevers as it continues to respond to residual viral particles or inflammation in the body. This can be particularly pronounced in the evening when the body’s circadian rhythms can influence immune activity.

2. Inflammation: COVID-19 can lead to a prolonged inflammatory response, which may cause symptoms like fever and headaches. This inflammation can be due to the body’s ongoing response to the virus or secondary infections that may occur after the initial illness.

3. Dehydration and Fatigue: If you are not adequately hydrating or resting, this can exacerbate feelings of malaise and lead to headaches. It’s essential to maintain fluid intake and rest during recovery.

4. Medication Effects: The medications you are taking, including antiviral treatments, can sometimes have side effects that include fever or headaches. It’s crucial to discuss any side effects with your healthcare provider.

5. Secondary Infections: Sometimes, after a viral infection, individuals may become susceptible to bacterial infections, which can also cause fever and other symptoms. If you notice any new or worsening symptoms, it’s important to consult your healthcare provider for further evaluation.

Given that you have been taking COVID-19 treatment and are experiencing these symptoms, it would be wise to keep in close contact with your healthcare provider. They may recommend further testing to rule out any secondary infections or complications. Additionally, they might suggest symptomatic treatments to help manage your fever and headaches.

In summary, while fluctuating fever and headaches after a COVID-19 diagnosis can be distressing, they are not uncommon. It’s essential to monitor your symptoms closely and maintain communication with your healthcare provider to ensure that you receive appropriate care and support during your recovery. If your symptoms worsen or new symptoms arise, seek medical attention promptly.

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