Skip to content
How It Works
Explore
Resources Ask a Question
Who It's For
Patients
Decode results, prep for appointments, weigh options.
Caregivers & advocates
Carry the research load for someone you love.
Providers & clinicians
Resources for patients in your practice.
Log In Ask a Question
PubMed This is a summary of 17 peer-reviewed journal articles Updated
Pulmonology · Genetic Interstitial Lung Disease

Signs, Symptoms, and the Diagnostic Journey

At a Glance

Genetic interstitial lung disease (ILD) is a rare condition that causes severe breathing problems. Because its symptoms mimic common illnesses like asthma or pneumonia, it is frequently misdiagnosed. If respiratory symptoms do not respond to standard treatments, specialized lung testing is needed.

The journey to a diagnosis of genetic interstitial lung disease (ILD) is often marked by a series of “false starts.” Because these conditions are rare, they are frequently mistaken for more common lung problems. Understanding how these symptoms show up at different ages—and what they are often confused with—can help you advocate for the right testing.

How Symptoms Appear Across the Lifespan

Genetic ILD is a “chameleon” disease; it looks different depending on when it first appears.

  • Infants (Neonatal Onset): In its earliest form, it often presents as severe respiratory distress in a full-term baby who was expected to be healthy [1][2]. Warning signs include rapid breathing, a blue tint to the skin (cyanosis), and a “failure to thrive” (not gaining weight as expected) [3][4].
  • Children: Symptoms may be more subtle, such as a persistent, dry cough or getting tired more easily than peers during play [5]. Children may also experience frequent lung infections that take a long time to clear [6].
  • Adults: Adult-onset genetic ILD (often SFTPC-related) usually looks like a slow, progressive shortness of breath during exercise [1][7]. Adults may have a history of “sensitive lungs” in childhood that seemingly disappeared, only to return as pulmonary fibrosis (lung scarring) in their 30s, 40s, or later [8][9].

Common Misdiagnoses

Because the symptoms overlap with common illnesses, many patients are initially told they have one of the following:

  1. Asthma: This is the most common misdiagnosis [10]. Unlike asthma, genetic ILD does not typically improve with rescue inhalers (bronchodilators).
  2. Recurrent Pneumonia: Patients may be treated with multiple rounds of antibiotics for “walking pneumonia” when the underlying issue is actually chronic inflammation from a genetic mutation [6].
  3. Bronchopulmonary Dysplasia (BPD): In infants, doctors may assume lung issues are due to prematurity or standard “newborn lung,” overlooking the possibility of a genetic surfactant disorder [6].

Progression: Infant vs. Adult Onset

The “natural history” or path of the disease varies significantly by the age it starts.

  • Infant-Onset: Often starts with a crisis. While some infants require long-term mechanical ventilation, others may stabilize and even show improvement as their lungs grow, though they often have long-term loss of lung function [11][12].
  • Adult-Onset: Tends to be a slower, “smoldering” progression [9]. It often moves from mild inflammation to permanent scarring (fibrosis) over several years [8].

Warning Signs: When to Seek Immediate Care

Certain symptoms, known as acute exacerbations, represent a sudden worsening of the disease and require urgent medical evaluation [13].

  • Increased Work of Breathing: Seeing the chest “sucking in” around the ribs (retractions).
  • Sudden Oxygen Drop: A noticeable change in skin color or a lower-than-normal reading on a pulse oximeter.
  • Extreme Fatigue: A sudden inability to perform daily tasks or keep up with usual activity levels [13][14].

Is This What You Are Experiencing?

If you or your child has a “respiratory illness that won’t go away,” or if symptoms are “refractory” (not responding) to standard treatments like inhalers, it may be a sign to push for specialized genetic testing and high-resolution imaging [15][16]. Findings like ground-glass opacities (hazy areas on a CT scan) or small lung cysts are key “diagnostic clues” for genetic ILD [9][17].

Common questions in this guide

Why is genetic ILD often misdiagnosed as asthma?
Genetic ILD shares common symptoms with asthma, such as chronic coughing and breathing difficulty. However, unlike asthma, symptoms of genetic ILD typically do not improve with the use of standard rescue inhalers.
What are the warning signs of a genetic ILD exacerbation?
Warning signs of a sudden worsening, or acute exacerbation, include a noticeable drop in oxygen levels, extreme fatigue, and increased work of breathing like the chest sucking in around the ribs. These signs require immediate medical attention.
How do genetic ILD symptoms differ between infants and adults?
In infants, the disease often starts as severe respiratory distress, rapid breathing, and poor weight gain. In adults, it usually presents as a slow, progressive shortness of breath during exercise and gradual lung scarring.
What clues on a CT scan suggest genetic ILD?
Doctors look for specific patterns on high-resolution CT scans, such as ground-glass opacities (hazy areas) or small lung cysts. These are key diagnostic clues that point to genetic surfactant disorders rather than common infections.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Does my (or my child's) CT scan show patterns like 'ground-glass opacities' or 'cysts' that are common in genetic surfactant disorders?
  2. 2.If the current diagnosis is asthma or pneumonia, why isn't the standard treatment (like inhalers or antibiotics) working as expected?
  3. 3.Are we looking for any 'extra-pulmonary' signs, like poor weight gain or thyroid issues, that could point to a specific genetic syndrome?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (17)
  1. 1

    THERAPIES FOR NEONATAL DISEASES OF THE SURFACTANT SYSTEM.

    McCray PB

    Transactions of the American Clinical and Climatological Association 2025; (135()):119-129.

    PMID: 40771632
  2. 2

    A New ABCA3 Gene Mutation c.3445G>A (p.Asp1149Asn) as a Causative Agent of Newborn Lethal Respiratory Distress Syndrome.

    Mitsiakos G, Tsakalidis C, Karagianni P, et al.

    Medicina (Kaunas, Lithuania) 2019; (55(7)) doi:10.3390/medicina55070389.

    PMID: 31331098
  3. 3

    Case Report: Hydroxychloroquine in an infant with NKX2-1-associated interstitial lung disease.

    Qing D, Xu X, Shi T, et al.

    Frontiers in pediatrics 2025; (13()):1619722 doi:10.3389/fped.2025.1619722.

    PMID: 41181172
  4. 4

    Congenital Deletion of Nedd4-2 in Lung Epithelial Cells Causes Progressive Alveolitis and Pulmonary Fibrosis in Neonatal Mice.

    Leitz DHW, Duerr J, Mulugeta S, et al.

    International journal of molecular sciences 2021; (22(11)) doi:10.3390/ijms22116146.

    PMID: 34200296
  5. 5

    Hydroxychloroquine, a successful treatment for lung disease in ABCA3 deficiency gene mutation: a case report.

    Shaaban W, Hammoud M, Abdulraheem A, et al.

    Journal of medical case reports 2021; (15(1)):54 doi:10.1186/s13256-020-02604-5.

    PMID: 33526094
  6. 6

    Surfactant protein C dysfunction with new clinical insights for diffuse alveolar hemorrhage and autoimmunity.

    Tang X, Shen Y, Zhou C, et al.

    Pediatric investigation 2019; (3(4)):201-206 doi:10.1002/ped4.12162.

    PMID: 32851322
  7. 7

    Genetic disorders of the surfactant system: focus on adult disease.

    van Moorsel CHM, van der Vis JJ, Grutters JC

    European respiratory review : an official journal of the European Respiratory Society 2021; (30(159)) doi:10.1183/16000617.0085-2020.

    PMID: 33597124
  8. 8

    Interstitial Lung Disease in Adulthood Associated with Surfactant Protein C Gene Mutation in a Patient with a History of Lipoid Pneumonia in Infancy.

    Furukawa T, Akaike K, Iyama S, et al.

    Internal medicine (Tokyo, Japan) 2023; (62(17)):2521-2525 doi:10.2169/internalmedicine.0980-22.

    PMID: 36642519
  9. 9

    A rare interstitial lung disease in young adulthood due to surfactant protein C gene mutation: Two case reports with brief literature review.

    Sengul Y, Gosche E, Hazelton T

    Radiology case reports 2025; (20(9)):4299-4303 doi:10.1016/j.radcr.2025.05.051.

    PMID: 40575365
  10. 10

    An SFTPC gene mutation causes childhood interstitial lung disease: first report in the Arab region.

    Alzaid MA, Eltahir S, Amin Ur Rahman M, et al.

    JRSM open 2020; (11(2)):2054270419894821 doi:10.1177/2054270419894821.

    PMID: 32095252
  11. 11

    Chronic ventilation in infants with surfactant protein C mutations: an alternative to lung transplantation.

    Liptzin DR, Patel T, Deterding RR

    American journal of respiratory and critical care medicine 2015; (191(11)):1338-40 doi:10.1164/rccm.201411-1955LE.

    PMID: 26029841
  12. 12

    Childhood interstitial lung disease survivors in adulthood: a European collaborative study.

    Manali ED, Griese M, Nathan N, et al.

    The European respiratory journal 2025; (65(2)) doi:10.1183/13993003.00680-2024.

    PMID: 39638417
  13. 13

    Acute exacerbations in children's interstitial lung disease.

    Seidl E, Schwerk N, Carlens J, et al.

    Thorax 2022; (77(8)):799-804 doi:10.1136/thoraxjnl-2021-217941.

    PMID: 35149584
  14. 14

    Design of the PF-ILD trial: a double-blind, randomised, placebo-controlled phase III trial of nintedanib in patients with progressive fibrosing interstitial lung disease.

    Flaherty KR, Brown KK, Wells AU, et al.

    BMJ open respiratory research 2017; (4(1)):e000212 doi:10.1136/bmjresp-2017-000212.

    PMID: 29018526
  15. 15

    Congenital Cytomegalovirus Pneumonitis Mimicking Childhood Interstitial Lung Disease: A Case Report and Review of Diagnostic Challenges.

    Al Abdali K, Al Wardi T, Elfatih R, et al.

    Cureus 2025; (17(7)):e87869 doi:10.7759/cureus.87869.

    PMID: 40809653
  16. 16

    Childhood interstitial lung disease: The end of a diagnostic odyssey.

    Chan KJ, Thong MK, Nathan AM, et al.

    Annals of the Academy of Medicine, Singapore 2022; (51(10)):651-652 doi:10.47102/annals-acadmedsg.202257.

    PMID: 36317576
  17. 17

    Rare genetic interstitial lung diseases: a pictorial essay.

    Borie R, Berteloot L, Kannengiesser C, et al.

    European respiratory review : an official journal of the European Respiratory Society 2024; (33(174)) doi:10.1183/16000617.0101-2024.

    PMID: 39537246

This page provides educational information on the symptoms and diagnosis of genetic interstitial lung disease. It is not a substitute for professional medical advice, diagnosis, or treatment by a qualified pulmonologist.

Get notified when new evidence is published on Interstitial lung disease 2.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.