Persistent Fever for Over Two Months: What to Do Next? - Family Medicine

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Fever of unknown origin with persistent fever?


Hello doctor, my family member is a 45-year-old female who has had a persistent fever ranging from 37.5 to 38.5 degrees Celsius for over two months.
We have conducted all possible tests and even visited a large hospital, but no definitive cause has been identified.
What should we do next?

77, 40~49 year old female. Ask Date: 2018/02/26

Dr. Chen Bozhang reply Family Medicine


Dear Ms.
77,
You mentioned that a family member has been experiencing persistent fever for over two months, despite undergoing numerous tests.
There are many potential causes for unexplained fever, including underlying infections, rheumatologic or autoimmune diseases, or tumors, among others.
It is advisable to prioritize consulting an infectious disease specialist at a hospital, and if necessary, consider inpatient evaluation to clarify the condition.
Sincerely,
Dr.
Chen Po-Chang,
Department of Family Medicine, Keelung Hospital, Ministry of Health and Welfare

Reply Date: 2018/02/26

More Info


Persistent fever lasting for over two months can be quite concerning, especially when it ranges between 37.5°C to 38.5°C (99.5°F to 101.3°F) and does not respond to typical treatments. Given that your family member has undergone various tests at a major hospital without a definitive diagnosis, it is crucial to approach this situation methodically.

First, it is important to understand that persistent fever can be caused by a wide array of conditions, including infections (bacterial, viral, or fungal), autoimmune diseases, malignancies, and even certain medications or environmental factors. The fact that extensive testing has not yielded results suggests that the cause may be more elusive or less common.

Here are some steps to consider moving forward:
1. Re-evaluate Previous Tests: It may be beneficial to review the tests that have already been conducted. This includes blood tests (like complete blood count, inflammatory markers such as CRP and ESR), imaging studies (like X-rays or CT scans), and any cultures that were taken. Sometimes, a second look at the results with a fresh perspective can reveal overlooked details.

2. Consult a Specialist: If not already done, consider consulting with an infectious disease specialist or a rheumatologist. These specialists are often more familiar with atypical presentations of diseases and can provide insights into less common causes of fever.

3. Consider a Fever Workup: A comprehensive fever workup may include tests for specific infections (like tuberculosis, HIV, or other endemic diseases), autoimmune markers, and possibly a bone marrow biopsy if hematological issues are suspected.
4. Look for Patterns: Keeping a detailed diary of symptoms can help identify any patterns or triggers associated with the fever. Note any accompanying symptoms, dietary changes, stress levels, and environmental factors. This information can be invaluable for healthcare providers.

5. Evaluate for Autoimmune Disorders: Conditions like lupus, rheumatoid arthritis, or vasculitis can present with persistent fever. Specific blood tests can help rule these out.

6. Consider a PET Scan: If there is a suspicion of malignancy or an undetected infection, a PET scan can be useful in identifying areas of increased metabolic activity that may indicate infection or cancer.

7. Supportive Care: While pursuing a diagnosis, ensure that your family member is receiving adequate supportive care. This includes hydration, nutrition, and rest. Managing symptoms like fever with antipyretics (e.g., acetaminophen or ibuprofen) can help improve comfort.

8. Holistic Approach: Sometimes, persistent symptoms can be exacerbated by stress or psychological factors. Consulting with a mental health professional may also be beneficial to address any anxiety related to the ongoing health issues.

9. Follow-Up: Regular follow-ups with healthcare providers are essential. If symptoms worsen or new symptoms develop, immediate medical attention should be sought.

In summary, persistent fever without a clear cause can be frustrating and concerning. It is essential to continue seeking medical advice, possibly from specialists, and to keep thorough records of symptoms and test results. With persistence and a comprehensive approach, the underlying cause can often be identified and treated appropriately.

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