Are you feeling short of breath these days? At first, you noticed it on the stairs. You used to climb them easily. Now you pause at the top to catch your breath. Or maybe it happens while walking to your car, carrying groceries or playing with your grandchildren.
At first, it’s easy to dismiss. You might think you’re out of shape, getting older or dealing with allergies. But when shortness of breath, cough and fatigue (tiredness) slowly worsen over time, it could be your body trying to tell you something.
For some people, these symptoms could be the first signs of a condition called interstitial lung disease (ILD). It’s not the most common condition but it can be easy to overlook.
What is interstitial lung disease?
Interstitial lung disease isn’t a single disease. It’s a group of more than 200 conditions that affect the lungs, including idiopathic pulmonary fibrosis. In simple teams, ILD causes inflammation and scarring (fibrosis) in the lung tissue.
“Interstitial sounds complicated but it just refers to the tissue around the small air sacs (the interstitium) in your lungs,” said Sachin Chaudhary, MD, a pulmonologist with Banner - University Medicine. “When that tissue gets scarred, your lungs can’t do their job well and you can feel it.”
That scarring slowly makes your lungs stiffen, which means it takes more effort to breathe and it’s harder for oxygen to get into your bloodstream.
Symptoms of interstitial lung disease
The tricky part of ILD is that it tends to sneak up on you. The symptoms don’t hit all at once. They grow slowly, over months or even years.
“Early ILD can be very subtle,” Dr. Chaudhary said. “Because these symptoms develop so slowly, many people chalk them up to aging or being out of shape.”
The three most common symptoms are:
- Shortness of breath: You might find yourself breathing harder than usual when you walk uphill, climb stairs or move quickly. Over time, even easier tasks might leave you breathless.
- A dry, chronic cough: This cough is dry and it just won’t quit. It can go on for months or even longer.
- Fatigue: A kind of tiredness that doesn’t have an obvious cause. You sleep but you’re still dragging.
Other possible symptoms include:
- Appetite and weight loss
- Chest pain
- Clubbing (rounded fingertips) in later stages
Why is ILD often diagnosed late or missed?
You might have already visited your health care provider or several specialists. You may have been treated for something like asthma, acid reflux or heart problems. And maybe you got a little better for a while but the breathlessness kept coming back. That’s a common story with ILD.
Overlapping symptoms
The symptoms often overlap with many other, more familiar conditions. Shortness of breath and cough can point to asthma, COPD, allergies and heart disease, all of which are more common than ILD. And because symptoms happen over time, it can be hard to notice how much things have worsened.
Early tests may look normal
To make things harder, a standard chest X-ray may not show signs early on. This can delay further testing.
This delay can be frustrating but it’s also very common. If you’ve been searching for answers, it’s worth talking to a pulmonologist, a doctor who specializes in lung conditions.
What causes interstitial lung disease?
There’s no single cause. ILD can develop for many different reasons. And in some people, there is no clear answer.
Here are some of the most common causes:
- Idiopathic pulmonary fibrosis: This is one of the most frequently seen types, especially in older adults. Idiopathic means the cause is unknown.
- Autoimmune conditions: Diseases like rheumatoid arthritis or scleroderma can affect the lungs, leading to ILD in some people.
- Environmental and occupational exposures: Breathing in mold, bird droppings or certain types of dust over the years can lead to a type of ILD called hypersensitivity pneumonitis.
- Certain medications: Some drugs, including specific chemotherapy agents, heart medication called amiodarone and some cancer immunotherapy drugs, can damage lung tissue over time.
How is interstitial lung disease diagnosed?
If your health care provider suspects ILD, they’ll likely refer you to a pulmonologist and other specialists.
“The evaluation frequently involves a teach approach,” Dr. Chaudhary said. “Pulmonology, radiology, pathology and rheumatology may all play a role in arriving at a confident diagnosis. It takes a real collaboration to get it right.”
Diagnosis often involves several steps:
- Pulmonary function testing: These breathing tests measure how well your lungs work. They check how much air you can take in and how well oxygen crosses from your lungs into your blood. In ILD, these numbers often show a specific pattern that signals something is off.
- High-resolution CT scan: This is a detailed scan of lung tissue. This is one of the most important tools for diagnosing ILD. It can show patterns of scarring that a regular X-ray might miss entirely.
- Blood tests: These can help check for autoimmune disease or other underlying causes.
In some cases, you may need:
- A bronchoscopy (a small camera to look inside the lungs)
- A lung biopsy
Treatment options for interstitial lung disease
Treatment depends on what type of ILD you have and how your condition is behaving. The goal is often to slow the progression of the disease and improve quality of life.
Treatment might include:
- Medications: For fibrotic types of ILD, some medications (antifibrotics) can help slow lung scarring. Others reduce inflammation if the immune system is involved.
- Oxygen therapy: If oxygen levels are low, supplemental oxygen can help you breathe easier and stay active.
- Pulmonary rehabilitation: This is a structured program of exercises and breathing strategies that can help improve how you feel day to day and help you stay as active as possible.
- Lung transplantation: In more severe cases, a lung transplant may be considered.
Research in this area is advancing quickly and experts like Dr. Chaudhary are watching it closely. New treatment approaches and improved methods for personalizing care are being actively explored. If you're living with ILD, the treatment options are more promising than they were just a few years ago.
When should you seek care?
It’s easy to ignore symptoms that develop gradually. However, you should talk to your health care provider if you notice:
- Shortness of breath that keeps getting worse
- A dry cough that lasts for months
- Fatigue that doesn’t improve
- Trouble keeping up with normal daily activities
- Any combination of these symptoms, especially if you are over 50 and have a history of autoimmune conditions
Early evaluation is important. The earlier ILD is found, the more treatment options you have and the better your chances of slowing down its progression.
Frequently asked questions
What is interstitial lung disease?
It is a group of lung conditions that cause inflammation and scarring, making it harder to breathe.
What are the early symptoms of ILD?
Shortness of breath, a dry cough and fatigue that gradually worsen.
What causes ILD?
Causes include autoimmune diseases, environmental exposures, medications and unknown factors.
What’s the difference between ILD and COPD?
Both conditions affect the lungs and cause breathing difficulties but they work differently. COPD makes it hard to exhale air, while ILD makes it difficult to inhale air and limits how well oxygen passes into the bloodstream. However, their early symptoms can overlap.
How is ILD diagnosed?
It is diagnosed through a combination of imaging, lung tests, blood work and sometimes biopsy.
Takeaway
Shortness of breath, a lingering cough and fatigue that gradually worsens are warning signs not to ignore. Sometimes, these symptoms may indicate interstitial lung disease.
If you experience these symptoms or have concerns, talk to your provider or schedule an appointment with a Banner Health specialist. They can help you understand what’s happening and determine the best next steps.
