VHOSPITAL.CLINIC · Differential Diagnosis
Pneumonia vs Tuberculosis (TB)
Clinical comparison — shared symptoms, key differences, distinguishing diagnostic tests, treatment pathways, and when to seek urgent evaluation.
Condition Overview
Condition A
Pneumonia
Pneumonia is an infection that inflames the air sacs (alveoli) in one or both lungs, which may fill with fluid or pus. It can be caused by bacteria, viruses, or fungi and ranges from mild to life-threatening.
Condition B
Tuberculosis (TB)
Tuberculosis is an infectious disease caused by Mycobacterium tuberculosis, primarily affecting the lungs with symptoms of chronic cough, night sweats, fever, and weight loss. Drug-resistant TB is a growing global health threat requiring prolonged combination antibiotic therapy.
Shared Symptoms — Why They're Confused
Both conditions present with 4 overlapping symptoms, making clinical differentiation essential.
Key Clinical Differences
Pneumonia
- Acute onset with high fever, rigors, productive cough
- Responds to standard antibiotics within 48–72 hours
- No night sweats or significant weight loss
- Community exposure or seasonal pattern
Tuberculosis (TB)
- Subacute/chronic course: weeks to months of symptoms
- Night sweats, significant weight loss, haemoptysis
- Upper lobe infiltrates or cavitation on imaging
- History of TB contact, immunosuppression, or endemic area
Distinguishing Diagnostic Tests
| Test | Pneumonia | Tuberculosis (TB) |
|---|---|---|
| Chest X-ray | Lower/middle lobe consolidation — typical acute pneumonia | Upper lobe infiltrates, cavitation, apical scarring |
| Sputum AFB smear + culture | Negative for Mycobacterium tuberculosis | Positive AFB smear; culture confirms M. tuberculosis |
| Mantoux / IGRA (QuantiFERON) | Usually negative | Positive — TB infection (active or latent) |
Treatment Approaches
Pneumonia
- •Standard antibiotics: amoxicillin ± macrolide
- •Duration 5–7 days (community-acquired)
Tuberculosis (TB)
- •RIPE therapy: Rifampicin, Isoniazid, Pyrazinamide, Ethambutol ×2 months then RI ×4 months
- •Notify public health; contact tracing
- •DOT (directly observed therapy) for adherence
When Doctors Consider Each Diagnosis
🔵 Consider Pneumonia when:
- →Acute onset, responds to standard antibiotics, no weight loss or night sweats
🟢 Consider Tuberculosis (TB) when:
- →Weeks of cough and constitutional symptoms, upper lobe changes, positive IGRA or AFB
Explore Each Condition in Detail
Related Clinical Pages
Pneumonia
Medical References
Content on this page is informed by evidence-based clinical sources including:
- World Health Organization (WHO)Global health guidance and disease classification
- National Health Service (NHS)UK clinical guidelines and patient information
- National Institute for Health and Care Excellence (NICE)Evidence-based clinical practice guidelines
- Centers for Disease Control and Prevention (CDC)US public health data and clinical recommendations
- PubMed – NCBIPeer-reviewed biomedical literature and clinical studies
- Cochrane LibrarySystematic reviews and meta-analyses in evidence-based medicine
Not sure which condition applies to you?
Describe your symptoms and get a structured clinical assessment — possible causes, red flags, and recommended next steps.
Start Free AI Analysis →