At my clinic at Asian Heart Institute, I frequently meet individuals who have been experiencing breathlessness for months and sometimes even for years. During the initial consultation I question them about their home, especially their balcony or building. And I often hear the answer which does not surprise me anymore:
“Pigeons have been nesting there for years.”
Mumbai has one of the largest pigeon populations in India. They are everywhere:
- on balconies,
- building ledges,
- water tanks,
- and around temples where they are regularly fed.
For many Mumbaikars, seeing pigeons every day has become a routine part of city life. However, people do not realise that regular exposure to pigeon droppings and feathers can sometimes lead to a serious lung condition called ‘bird fancier’s lung’, a type of interstitial lung disease (ILD) or hypersensitivity pneumonitis.
The good news: if it’s detected early, bird fancier’s lung can often be treated effectively.
Read Also: Feeling Breathless? Here’s How to Tell If It’s Your Heart or Your Lungs
What Is Bird Fancier’s Lung?
Bird fancier’s lung is a type of hypersensitivity pneumonitis (an inflammatory reaction to certain substances that you breathe in). It develops when the lungs react to proteins present in bird droppings, feathers, and the fine dust generated from dried bird excreta that you inhale.
On repeated exposure to these proteins, the immune system may start reacting against them, causing inflammation deep inside the lung tissue.
Over time, if the exposure remains undetected, this inflammation can progress into permanent scarring of the lung tissue known as pulmonary fibrosis (a stage where damage is no longer fully treatable, only manageable).
That’s why I often tell my patients the same thing: Bird fancier’s lung is a respiratory condition where catching it early changes everything.
How Long Does It Take to Develop a Bird Fancier’s Lung?
Acute Form:
It may take an average of 1.6 years of exposure to develop.
Subacute Form:
Develops over weeks to months.
Chronic Form:
It may take an average of 15 to 16 years of continuous exposure. This can lead to permanent and irreversible lung scarring.
Why Bird-Related Lung Disease Is More Common in Mumbai
The following factors increase the risk:
- Open balconies and window grills suitable for pigeons to nest easily.
- Feeding areas near temples and public places attract large, resident pigeon populations rather than migratory ones.
- Water kept outside homes attracts birds
- Humid weather, which allows droppings to dry into fine dust that becomes airborne
Many people are exposed for years without realizing it.
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Symptoms of Bird-Related ILD That You Should Never Ignore
In my experience, patients with bird-related ILD typically involve the following:
- A dry cough that has lasted more than 8 weeks
- Breathlessness on climbing stairs or walking short distances, which gradually worsens
- Unusual tiredness that doesn’t match their activity level
- Occasional low-grade fever after cleaning a balcony, terrace, or window grill
- In some cases, mild weight loss over several months
Here is the tricky part: these symptoms build up so gradually that people and sometimes their family physicians link them to age or general fitness decline. Therefore, comprehensive evaluation is necessary.
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How We Diagnose It
When I suspect bird-related ILD, the following are the lab tests I generally recommend:
| Test | Detail |
| A detailed exposure history | This is often the single most important step, and one that’s easy to miss unless specifically asked about |
| High-resolution CT (HRCT) of the chest | Which shows a characteristic pattern of lung involvement |
| Pulmonary function tests (PFTs) | Measure how well the lungs are working |
In select cases, a bronchoscopy with bronchoalveolar lavage, or occasionally a lung biopsy, to confirm the diagnosis when the picture is unclear
Read Also: Fluid Keeps Coming Back in Your Chest? Understanding Recurrent Pleural Effusion
Can Bird Fancier Lungs be Treated?
Yes
This is the most important message I want every Mumbai resident to take away: early bird fancier’s lung is often reversible.
Stopping further exposure to pigeons is the integral part of the treatment.
This may include:
- Preventing pigeons from nesting on balconies and window grills
- Professionally cleaning old pigeon droppings
- Using masks and wet cleaning methods instead of dry sweeping
- Installing bird nets where needed
Depending on how advanced the disease is, treatment may also include:
- Corticosteroids to reduce inflammation
- Anti-fibrotic medicines if scarring has already started
- Pulmonary rehabilitation to improve breathing and stamina
- Regular follow-up with lung function tests and scans
Read Also: Pulmonary Rehab for COPD: What You Need to Know
A Simple Message for Mumbai Families
If pigeons have been nesting on your balcony, window grills, or water tank for years, and someone in your family has an unexplained cough or increasing breathlessness, do not ignore it.
It may not be bird fancier’s lung, but it’s worth getting checked. This can help diagnose a lung disease before permanent damage happens.
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FAQs
Q1: Can I get this disease even if pigeons don’t live inside my house?
A: Yes.
Even having pigeons regularly nest on a balcony, ledge, or water tank near a window is enough. Dried droppings release fine protein particles into the air that can travel indoors, especially during cleaning or strong winds.
Q2: Will my lungs recover if I remove the pigeons?
A: If the disease is caught in its early, inflammatory stage, significant recovery is possible. If fibrosis (permanent scarring) has already developed, the existing scarring will not reverse, but stopping exposure prevents further damage.
Q3: Is this the same as tuberculosis or asthma?
A: No.
Bird fancier’s lung is a distinct condition under the ILD category, caused by an immune reaction to bird proteins, not by infection (like TB) or airway constriction (like asthma). However, its symptoms can overlap, which is why proper testing is important rather than self-diagnosis.
Q4: Should housing societies be concerned?
A: Yes.
Housing societies with long-standing pigeon colonies on common ledges, water tanks, or stairwells should consider netting and professional cleaning, particularly if multiple residents report chronic respiratory symptoms.
Q5: Who should I consult if I suspect bird fancier’s lung?
A: A pulmonologist or thoracic surgeon experienced in interstitial lung disease can evaluate your history, order the right tests, and guide treatment.
About the Author
Dr. Bhushan Thombare is a Senior Consultant Thoracic Surgeon at Asian Heart Institute, Bandra Kurla Complex, Mumbai
Have questions about a persistent cough or breathlessness? [Book a consultation with Dr. Thombare] at Asian Heart Institute.
Medical Disclaimer: This article is for general patient education and does not replace an in-person consultation. If you have breathlessness, a persistent cough, or any respiratory symptoms, please see a pulmonologist or thoracic surgeon for proper evaluation.
