Sometimes you just get a cold, a cough, and a little difficulty breathing, right? It gets better in two or three days. But if this keeps happening, especially if these symptoms increase when you go to your home environment or work, it may not be normal. Today we are talking about a condition that can be a little serious, but that many people are not aware of. That is Hypersensitivity Pneumonitis, or HP for short.
Simply put, what is Hypersensitivity Pneumonitis (HP)?
Hypersensitivity Pneumonitis (HP) is, to be precise, an allergy that affects our lungs . But this is not like the allergy we usually know to pollen or dust. What happens in this is that the tiny air sacs (alveoli) in our lungs overreact to very small particles (which we call allergens) that we breathe in. This causes swelling, or inflammation , in those air sacs.
These symptoms can come on suddenly (acute) and go away quickly, or they can gradually increase over time and become persistent (chronic).
How is this different from a normal allergy?
Imagine, when you have an allergy to dust, you get a runny nose and sneezing. But with HP, it's different. When we are continuously exposed to the particles that cause this, that is, when we breathe them in, our lungs can be permanently damaged . Over time, scarring can even occur in the lungs. We call this condition ` interstitial lung disease `. So it's not good to think of it simply as a normal allergy.
Who is at higher risk of developing Hypersensitivity Pneumonitis?
Although this disease can affect anyone, people who work in certain jobs and live in certain environments are at higher risk because they are constantly inhaling particles that cause it. Let's see who they are.
| Risk group | A simple explanation |
|---|---|
| People who work on farms | People who frequently interact with things like cattle, vegetables, hay, and grains can inhale mold and bacteria. |
| People who work with animals | Veterinarians, people who raise birds or chickens, and people who clean bird cages can inhale particles from bird droppings and feathers. |
| Lumber mills and woodworkers | Inhalation of wood dust and molds that grow on wood. |
| People working in the metal industry | Inhalation of small chemical particles released during metal processing. |
| Indoor environment | Breathing in mold and bacteria from poorly maintained humidifiers, AC systems, hot tubs, etc. Using pillows and mattresses made from bird feathers is also a risk. |
| Age | It is usually most common in people between the ages of 50 and 70. |
The important thing is, this disease occurs when your immune system becomes "overly" sensitive to something. Not every farmer or bird breeder develops this.
What are the symptoms of this disease?
Symptoms of HP disease can come in two main forms. One is acute symptoms and the other is chronic symptoms.
| Acute HP | Chronic HP |
|---|---|
| These symptoms appear within a few hours of exposure to the allergen and go away within a few days. They may feel like a cold. | |
| - Difficulty breathing (dyspnea) | - Shortness of breath when exercising or being active |
| - Dry cough | - Persistent cough |
| - Feeling of tightness in the chest | - Extreme fatigue |
| - Feeling cold, shivering | - Weight loss without reason |
| - Fever | - Finger clubbing |
| - Body pain | |
Chronic HP develops gradually, so you may not be able to recognize it at first. The first thing you may notice is something like "I feel tired when I climb a few stairs now more than before."
How to diagnose the disease?
If you have these symptoms, your doctor will first ask you a lot of questions about your job, hobbies , and home environment to get an idea of what you might be allergic to. Then, the doctor will listen to your lungs with a stethoscope and check your oxygen levels with a clip-like device (a `pulse oximeter`).
In addition, tests like this can be done to confirm the disease accurately.
- Allergy blood tests: Special tests (a `hypersensitivity pneumonitis panel`) can be done to see if there are antibodies related to this allergy in your blood.
- Chest X-ray or CT scan: This can clearly see if there is swelling, scarring (fibrosis), or other damage to the lungs.
- Pulmonary function tests: This involves several tests that measure how well your lungs are working and how much air you can inhale and exhale.
- Bronchoscopy: In this, a tube with a small camera attached is passed through the nose or mouth into the lungs, where the inside is examined and, if necessary, a small sample of tissue is taken for examination.
How is it treated?
The most important and first step in treating this disease is to identify the allergen that causes the disease and completely avoid it.
If you continue to be exposed to it, no matter what medication you take, the disease will not be completely cured. In cases of Chronic HP, even if you stay away from the allergen, the damage to the lungs may continue to increase.
In addition to avoiding the allergen, your doctor may prescribe treatments like these.
| Treatment method | Description |
|---|---|
| Corticosteroids or immunosuppressive drugs | These medications help reduce inflammation in the lungs. Examples: `prednisone`, `mycophenolate`, `azathioprine`. |
| Anti-fibrotic drugs | These help slow down the rate of scarring in the lungs. Examples: `pirfenidone`, `nintedanib`. |
| Pulmonary rehabilitation | Breathing exercises and physical therapy can help make breathing easier. |
| Oxygen therapy | If the disease is severe, external oxygen is administered to provide the body with the necessary amount of oxygen. |
| Lung transplant | If the disease becomes very severe and the lungs stop functioning completely, a lung transplant may be the last option. |
How can you protect yourself from this disease?
The damage to the lungs in chronic HP is irreversible, so the best thing to do is to stay as far away from the allergens that cause it as possible.
- If you do hazardous work (e.g. farming, woodworking, working with birds), be sure to wear personal protective equipment (PPE) .
- Always keep humidifiers and AC systems in your home clean and in good condition.
- Avoid using pillows, mattresses, and bedding made from feathers.
- If you have pets, especially birds, keep their cages clean. Wear a mask when cleaning.
If you have already been diagnosed with HP, talk to your doctor and make a plan to prevent further damage to your lungs. Take your medications on time. Ask about breathing exercises you can do at home.
Take-Home Message
- Hypersensitivity Pneumonitis (HP) is not a common allergy. It can cause permanent damage to your lungs.
- The main reason for this is breathing in things like mold, bacteria, and chemicals from your work or home environment.
- If you have symptoms such as persistent cough, difficulty breathing, or fatigue, do not ignore it and see a doctor immediately .
- The best treatment for this disease is to completely avoid the cause of the disease. It is difficult to achieve a complete cure with medication alone.
- If the disease is detected early, it can be controlled before serious damage occurs to the lungs.
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