Fever is one of the most common medical symptoms, usually linked to infections or inflammation. But when a fever persists for more than three weeks without a clear cause, it is termed Pyrexia of Unknown Origin (PUO) or Unexplained Fever. PUO can be a diagnostic challenge and requires expert evaluation to uncover the underlying condition.
Dr. Preeti Ajapuje, Consultant in Infectious Diseases, HIV, TB, and Post-Transplant Infections in Koregaon Park, Pune, has extensive experience in diagnosing and managing complex fevers with a patient-centered and evidence-based approach.
What Is Pyrexia of Unknown Origin (PUO)?
PUO is defined as a fever of >38.3°C (101°F) lasting for at least three weeks, with no diagnosis after one week of hospital-based evaluation. It often points to hidden infections, autoimmune diseases, or malignancies.
Common Causes of PUO
- Infections: Tuberculosis, endocarditis, abscesses, or hidden bacterial/viral infections.
- Autoimmune/Inflammatory Diseases: Rheumatoid arthritis, lupus, vasculitis.
- Malignancies (Cancers): Leukemia, lymphoma, or other hidden tumors.
- Miscellaneous Causes: Drug reactions, thyroid disorders, or rare conditions.
How Doctors Diagnose PUO
Diagnosing PUO requires a systematic, step-by-step evaluation:
- Detailed Medical History: Past illnesses, travel, occupational exposure, and medications.
- Physical Examination: To identify subtle signs of hidden infection or disease.
- Laboratory Tests: Blood cultures, complete blood counts, inflammatory markers, and serological tests.
- Imaging Studies: X-ray, ultrasound, CT, or MRI scans to detect hidden infections or tumors.
- Specialized Tests: Biopsies, bone marrow tests, or advanced infectious disease panels when required.
The goal is to avoid unnecessary delays while ensuring no possible cause is overlooked.
Treatment Approach for PUO
Treatment depends entirely on the underlying cause:
- Infections: Targeted antibiotics, antifungals, or antivirals after confirmation.
- Autoimmune Diseases: Immunosuppressive or anti-inflammatory medications.
- Malignancies: Referral to oncology for chemotherapy, radiotherapy, or surgery.
- Supportive Care: Fever management, hydration, and monitoring while investigations continue.
Why Early Specialist Consultation Matters
- Prevents complications from undiagnosed infections or diseases.
- Ensures the correct treatment instead of trial-and-error approaches.
- Helps immunocompromised patients (HIV, post-transplant, elderly) avoid life-threatening infections.
Frequently Asked Question
Q: Can unexplained fever resolve on its own?
A: In some cases, mild PUO may resolve without treatment. However, persistent fever should never be ignored, as it may indicate serious conditions like tuberculosis, autoimmune disease, or cancer. Specialist evaluation is crucial for accurate diagnosis.
Why Choose Dr. Preeti Ajapuje for PUO Evaluation in Pune
- Specialist in infectious diseases and complex unexplained fevers
- Expertise in HIV, TB, and post-transplant infection-related fevers
- Advanced diagnostic and personalized treatment plans
- Trusted care at Koregaon Park, Pune with access to modern diagnostic tools
Pyrexia of Unknown Origin is not just a fever—it is a signal that something deeper may be affecting the body. Timely specialist consultation ensures the right diagnosis and treatment, leading to better recovery and peace of mind.
For expert evaluation of unexplained fever, consult Dr. Preeti Ajapuje, Consultant Infectious Disease Specialist in Koregaon Park, Pune.
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