"ILD is often misdiagnosed as COPD or asthma for months or years before the correct diagnosis is made. The key distinguishing feature: in ILD, breathlessness worsens on exertion and at rest progressively, without significant response to bronchodilators. A HRCT chest is essential — not just a plain X-ray," says Dr. Rajkumar Korra, MD (Pulmonology), Consultant Pulmonologist at Lalitha Chest & Skin Hospital, Karimnagar.
What Is Interstitial Lung Disease?
The interstitium is the delicate network of tissue and space between the air sacs (alveoli) of the lungs through which oxygen passes into the bloodstream. In ILD, inflammation or abnormal fibrosis (scarring) thickens this tissue, reducing oxygen transfer and lung compliance — making the lungs progressively stiffer and harder to expand.
Common Types of ILD
- Idiopathic Pulmonary Fibrosis (IPF) — The most serious type. Progressive scarring of unknown cause. Primarily affects men over 60 who have smoked. Median survival 3 to 5 years from diagnosis without anti-fibrotic therapy.
- Hypersensitivity Pneumonitis (HP) — Allergic ILD caused by repeated inhalation of organic antigens. Farmer's lung (fungal spores from mouldy hay) and bird-fancier's lung (pigeon or bird droppings) are classic examples. Potentially reversible if the trigger is identified and removed early.
- Connective tissue disease-associated ILD — Rheumatoid arthritis, systemic lupus erythematosus, and systemic sclerosis frequently cause ILD. Treatment targeting the underlying disease may improve the lung component.
- Occupational ILD — Silicosis (stone quarry workers), asbestosis, coal worker's pneumoconiosis. Preventable with proper occupational respiratory protection.
- Drug-induced ILD — Methotrexate, amiodarone, nitrofurantoin, and certain chemotherapy agents. Usually reversible when the drug is stopped.
Symptoms
- Progressive breathlessness on exertion — The hallmark symptom. Initially on significant effort; eventually at rest.
- Dry, persistent cough — Non-productive, often described as an irritating, tickling cough.
- Fatigue
- Clubbing of fingers — Abnormal widening and rounding of fingertips. Highly characteristic of IPF.
- Fine inspiratory crackles at the lung bases on stethoscope examination — a key finding on physical examination ("Velcro crackles").
Diagnosis
ILD diagnosis requires specialist evaluation. Plain chest X-rays often miss or underestimate ILD. The investigation pathway:
- HRCT (High-Resolution CT) chest — The most important imaging test. Shows specific patterns (honeycombing in IPF, ground-glass opacities, etc.) that guide diagnosis.
- Pulmonary function tests (spirometry + DLCO) — Shows restrictive pattern with reduced gas transfer.
- Autoimmune antibody panel — ANA, ANCA, anti-CCP, RF to identify connective tissue disease-associated ILD.
- Bronchoscopy with bronchoalveolar lavage (BAL) — For cellular analysis.
- Surgical lung biopsy — Occasionally required for definitive diagnosis of unusual cases.
Treatment
- Remove the cause where possible — Stop causative drugs, remove occupational and environmental triggers (the single most important step in HP).
- Anti-fibrotic therapy (for IPF) — Pirfenidone and nintedanib slow the progression of lung fibrosis in IPF. Available in India under the brand names Esbriet and Ofev/Vargatef. These do not reverse existing fibrosis — starting early maximises benefit.
- Immunosuppression (for inflammatory ILD) — Oral corticosteroids, azathioprine, or mycophenolate for hypersensitivity pneumonitis and connective tissue disease-associated ILD.
- Supplemental oxygen — For chronic hypoxaemia.
- Pulmonary rehabilitation — Improves exercise capacity and quality of life.
- Lung transplant — For selected patients with advanced IPF under specialist evaluation.
Frequently Asked Questions
Q: I have rheumatoid arthritis and my doctor mentioned I might have ILD. Should I be worried?
Yes, this must be evaluated — but it is also manageable. Connective tissue disease-associated ILD often responds well to treatment of the underlying autoimmune condition. A pulmonologist should assess with HRCT and pulmonary function tests, ideally in collaboration with a rheumatologist.
Q: Can ILD be cured?
It depends on the type. Hypersensitivity pneumonitis identified and treated early (by removing the trigger and using steroids) can resolve substantially. Drug-induced ILD often reverses when the drug is stopped. IPF cannot be cured — anti-fibrotic therapy slows progression significantly, and lung transplant can help selected patients.
Q: I live near a quarry and I am breathless. Is this related?
Yes, occupational dust exposure (silica from stone cutting or quarrying) causes silicosis — an occupational ILD. You should see a pulmonologist immediately for HRCT evaluation and pulmonary function testing.
Searching for "ILD specialist in Karimnagar" or "lung fibrosis treatment near me"? Visit Lalitha Chest & Skin Hospital. Dr. Rajkumar Korra provides comprehensive ILD evaluation with HRCT review, pulmonary function testing, bronchoscopy, and multi-disciplinary management. Book at +91 94413 59200.