VHOSPITAL.CLINIC · Differential Diagnosis
Lung Cancer vs Tuberculosis (TB)
Clinical comparison — shared symptoms, key differences, distinguishing diagnostic tests, treatment pathways, and when to seek urgent evaluation.
Condition Overview
Condition A
Lung Cancer
Lung cancer is the leading cause of cancer-related death worldwide, most commonly caused by smoking. It is categorized into non-small cell (NSCLC, 85%) and small cell (SCLC) types, with symptoms including persistent cough, blood in sputum, weight loss, and chest pain.
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 6 overlapping symptoms, making clinical differentiation essential.
Key Clinical Differences
Lung Cancer
- Persistent cough >3 weeks
- Haemoptysis
- Weight loss and night sweats
- Upper lobe abnormality on chest X-ray
Tuberculosis (TB)
- Positive AFB smear or culture — confirms mycobacterial infection
- Contact with TB or endemic area
- Responds to RIPE therapy
- No bronchoscopic mass lesion
Distinguishing Diagnostic Tests
| Test | Lung Cancer | Tuberculosis (TB) |
|---|---|---|
| Sputum AFB smear + culture / PCR (GeneXpert) | Negative — no mycobacteria | Positive AFB smear or M. tuberculosis PCR — diagnostic |
| CT-guided biopsy / bronchoscopy | Malignant cells confirmed on histology — lung carcinoma | Granulomatous inflammation with necrosis — TB |
| IGRA / Mantoux | Negative or weakly positive (non-specific) | Strongly positive — TB infection |
Treatment Approaches
Lung Cancer
- •Surgery, chemotherapy, immunotherapy depending on histology and stage
- •EGFR/ALK targeted therapy if driver mutation positive
- •Palliative radiotherapy for advanced disease
Tuberculosis (TB)
- •RIPE therapy ×6 months
- •Notification and contact tracing
- •DOT for adherence
- •Monitor for drug resistance
When Doctors Consider Each Diagnosis
🔵 Consider Lung Cancer when:
- →Smoker >40y, mass lesion on CT, malignant cells on biopsy, negative IGRA/AFB
🟢 Consider Tuberculosis (TB) when:
- →TB contact or endemic area, positive AFB/IGRA, granulomas on biopsy, responds to RIPE
Explore Each Condition in Detail
Related Clinical Pages
Lung Cancer
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
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