I have had a low-grade fever for the past 3 months. I have taken several medicines and am currently on Akurit-4 for TB treatment for the last 1 month and 1 week, but the fever is still persisting. My tests, like CBC, TB tests, CT scan, ultrasound, urine, and kidney tests, are normal. What could be the reason for the fever? Do I need more tests, and could it be something serious like cancer?

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I have had a low-grade fever for the past 3 months. I have taken several medicines and am currently on Akurit-4 for TB treatment for the last 1 month and 1 week, but the fever is still persisting. My tests, like CBC, TB tests, CT scan, ultrasound, urine, and kidney tests, are normal. What could be the reason for the fever? Do I need more tests, and could it be something serious like cancer?

Asked by Male, 39 · 3 months ago

Dr. S Aneela

M. Pharm (Pharmacology)., PhD

3 months ago

A low-grade fever continuing for several months can happen because of many reasons, and it does not always mean something serious like cancer. Even during Akurit-4 treatment, fever may take time to settle completely, especially if the infection was long-standing or the body is still recovering from inflammation. Viral infections, hidden infections, autoimmune conditions, medication reactions, thyroid problems, stress, or inflammatory disorders can also sometimes cause prolonged low fever despite normal routine tests. The fact that your CBC, CT scans, urine, and kidney tests are normal is somewhat reassuring, but a persistent fever still needs regular medical follow-up. Sometimes doctors may repeat certain investigations later or suggest additional tests depending on weight loss, appetite, cough, night sweats, weakness, or other symptoms that develop over time. Good hydration, adequate nutrition, proper sleep, and taking TB medicines regularly at the correct time remain very important during recovery. Avoid stopping treatment early without medical advice because incomplete TB treatment can create further complications. Talk to your doctor if the fever increases, weight loss becomes noticeable, appetite drops significantly, or if you develop breathing problems, swollen lymph nodes, severe weakness, or persistent night sweats.

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🩺 Possible Causes of Persistent Low-Grade Fever

The fever could be a drug fever caused by the medications in Akurit-4, which sometimes trigger mild immune reactions.
It may also indicate an incomplete response to TB treatment, as TB can take time to fully resolve.
Other infections or inflammatory conditions unrelated to TB might be causing the fever despite normal initial tests.

🧪 Importance of Normal Test Results

Normal CBC (complete blood count), imaging (CT scan, ultrasound), urine, and kidney tests suggest there is no obvious infection, organ damage, or systemic illness detected so far.
This reduces the likelihood of severe complications or widespread disease at this point.

🩺 Need for Further Evaluation

Additional tests such as inflammatory markers (e.g., ESR, CRP), repeat imaging, or specialized TB cultures might be considered.
Referral to a pulmonologist or infectious disease specialist can help tailor further investigations and treatment adjustments.

⚕️ Cancer Consideration

Persistent fever can rarely be a sign of malignancy, but with normal imaging and labs, cancer is less likely currently.
If new symptoms like weight loss, night sweats, or lymph node swelling develop, further cancer screening may be warranted.

🩺 Next Steps and Monitoring

Continue close follow-up with your TB specialist to monitor symptoms and treatment response.
Report any new or worsening symptoms promptly.
Seek urgent care if you develop high fever, severe weakness, breathing difficulty, or other alarming signs.

Consult your pulmonologist or infectious disease doctor for personalized evaluation and to decide if more tests are needed.

Answered 3 months ago