Hypersensitivity Pneumonitis (HP)
Immune Reaction in the Lungs Due to Repeated Environmental Exposure
Hypersensitivity Pneumonitis is an inflammatory lung disease caused by repeated inhalation of allergens such as dust, mold, or bird proteins. Over time, it can lead to lung scarring (fibrosis) and permanent breathing impairment if exposure continues.
Breathlessness After Exposure to Dust, Birds, or Mold?
Early identification can prevent permanent lung damage
How HP Affects the Lungs
Allergen Exposure
Birds, mold, dustImmune Reaction
Inflammation beginsLung Damage
Fibrosis developsRespiratory Failure
Oxygen dependencyGood News: Early Stage is Reversible!
Identifying triggers early and avoiding exposure can reverse the disease completely. Chronic exposure leads to permanent lung damage.
What is Hypersensitivity Pneumonitis?
Hypersensitivity Pneumonitis occurs when the immune system reacts to inhaled organic particles.
Common triggers include:
Bird droppings/feathers
Moldy hay (farmer's lung)
Dust from AC/humidifiers
This leads to:
- Lung inflammation
- Reduced oxygen exchange
- Possible progression to fibrosis
Early Signs & Symptoms
Symptoms linked to environment → Important diagnostic clue
Acute Phase
Subacute Phase
Chronic Phase
Common Causes & Risk Factors
Common Causes
- Bird exposure (pigeon breeders)
- Agricultural dust
- Mold exposure
Risk Factors
- Occupational exposure (farmers, poultry workers)
- Poor ventilation
- Repeated allergen exposure
Disease Progression
Acute HP
Reversible inflammation
Best time for intervention
Subacute HP
Persistent symptoms
Fatigue, weight loss
Chronic HP
Lung fibrosis develops
Progressive breathlessness
End Stage Lung Disease
Severe scarring
Lung transplant required
Diagnosis & Tests
Detailed exposure history
Most important diagnostic clueHRCT chest
Pulmonary function tests
Blood tests (immune markers)
Check Your Lung Function
Understand your exposure-related lung risk
Treatment Options (Before Transplant)
1. Avoid Trigger Exposure
- Most critical step
- Can reverse early disease
2. Medications
- Steroids
- Immunosuppressants
3. Pulmonary Rehabilitation
- Breathing exercises
- Physical conditioning
When is Lung Transplant Needed?
Advanced fibrosis develops
Severe breathlessness persists
Oxygen dependency occurs
Early Avoidance Can Reverse Disease
Identifying triggers early is key
Important: Environmental Disease
Exposure history is critical • Early stages are reversible • Chronic exposure leads to permanent damage
Medical Management vs Transplant
Medical Management
Stage: Early/Subacute • Goal: Reduce inflammation • Outcome: Good if early
Lung Transplant
Stage: Advanced fibrosis • Goal: Replace lungs • Outcome: Life-saving
Lung Transplant Options
Single Lung Transplant
Selected cases
Double Lung Transplant
Preferred in fibrosis
Better outcomesGet My Treatment Plan
Cost & Planning
Costs depend on:
Stage of disease
Oxygen requirement
Hospital & city
Download Guide
Lung Transplant Cost & Planning Guide
Free & confidentialGet Expert Help
Find Pulmonologists
Find SpecialistExplore Verified Lung Transplant Hospitals
Patient Resources
Exposure checklist
Workplace safety guide
Breathing exercise plan
Pre-transplant workup
Frequently Asked Questions
Hypersensitivity pneumonitis is preventable with early detection.
Avoiding triggers can stop disease progression. Stay informed. Act early.