Why Do Some People Get Bronchitis More Often Than Others?

Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

This article is part of the PlexusDx Education Hub — your resource for evidence-based guidance on respiratory & immune health. Browse all Respiratory & Immune Health education

Some people breeze through cold season with, at worst, a lingering cough. Others develop bronchitis several times a year, often after every upper-respiratory infection. The difference is rarely bad luck alone. Airway defense, mucus clearance, and how forcefully the lungs respond to inflammation are all shaped by inherited biology working alongside exposures like smoke and air quality.

The short answer: recurrent bronchitis is rarely random

Bronchitis is inflammation of the bronchial tubes, the airways that carry air into the lungs. When those airways are irritated, they swell and produce excess mucus, triggering the wet, persistent cough that defines the condition. Whether an ordinary viral infection stops at a head cold or descends into the chest depends partly on how efficiently your airway lining clears pathogens and how tightly your body regulates the inflammatory response once it starts.

Repeated episodes point to an underlying susceptibility. That susceptibility is a blend of anatomy, immune tone, environmental load, and inherited variation in the genes that protect lung tissue.

What bronchitis actually is: acute versus chronic

Acute bronchitis is usually viral, lasts a few weeks, and resolves as the infection clears. Chronic bronchitis is defined clinically as a productive cough on most days for at least three months across two consecutive years, and it falls under the umbrella of chronic obstructive pulmonary disease (COPD). People who get acute bronchitis repeatedly are not necessarily developing the chronic form, but frequent inflammation of the same tissue is worth understanding rather than ignoring.

The genetic layer: SERPINA1 and lung protection

One of the most established genetic contributors to lung vulnerability is SERPINA1, the gene that codes for alpha-1 antitrypsin. This protein shields lung tissue from neutrophil elastase, an enzyme released during inflammation that, unchecked, digests the elastic walls of the airways. Variants such as the Z allele (rs28929474) lower circulating alpha-1 antitrypsin, leaving lung tissue with less protection during each inflammatory episode.

People who carry these variants may notice more frequent chest infections, a cough that lingers longer, or breathing symptoms that appear earlier in life than expected, especially if they smoke. SERPINA1 status does not cause bronchitis on its own, but it changes how much damage a given episode can do and how quickly the airways recover.

Oxidative stress, detox genes, and airway inflammation

Every respiratory infection and every lungful of polluted or smoky air generates oxidative stress. Genes in the glutathione S-transferase family, including GSTM1 and GSTT1, help neutralize those reactive compounds. Common deletions that leave a person with no functional copy of GSTM1 are associated with reduced antioxidant defense in the airways and greater sensitivity to cigarette smoke and pollution. When detoxification capacity is lower, the same exposure produces more airway irritation and a stronger, more prolonged inflammatory response.

Environmental multipliers you can change

Genetics sets the baseline, but exposures decide how often that baseline is tested. Smoking is by far the largest modifiable driver of recurrent and chronic bronchitis, and it compounds the risk carried by SERPINA1 and GST variants. Air pollution, occupational dust and fumes, poorly controlled asthma or allergies, acid reflux, and vitamin D insufficiency all raise the odds of repeat episodes. Addressing these does not rewrite your genes, but it removes the pressure that turns an inherited susceptibility into a recurring problem.

Where genetic insight fits

Understanding your own biology is the first step toward a smarter conversation with your provider. The PlexusDx Precision Peptide Genetic Test looks at how your genes influence biological pathways across 14 pathways, 49 peptides, 150+ genetic insights. It is an educational tool that reveals pathway-level context, not a diagnosis of bronchitis or any lung condition and not a treatment plan. What it offers is a clearer picture of the inflammation and cellular-defense pathways that shape how your body responds to respiratory stress.

Frequently Asked Questions

Is recurrent bronchitis inherited?

Susceptibility can be inherited, but bronchitis itself is not passed down like eye color. Variants in genes such as SERPINA1 and GSTM1 influence lung protection and antioxidant defense, which affects how often infections settle into the chest. Environment and smoking still play a decisive role.

Can a genetic test diagnose bronchitis?

No. Genetic testing does not diagnose, treat, or prevent bronchitis. It provides pathway-level context about inflammation and cellular-defense biology that you can discuss with a qualified provider. Diagnosis of any respiratory condition requires clinical evaluation, symptom history, and, when appropriate, lung-function or imaging tests.

Should I get tested for alpha-1 antitrypsin deficiency?

If you have frequent chest infections, early or unexplained breathing symptoms, or a family history of lung or liver disease, ask a healthcare provider about dedicated alpha-1 antitrypsin testing. That is a specific clinical test and a decision to make with a clinician, separate from general genetic education.

Curious how your genes influence the inflammation and defense pathways behind respiratory resilience? Explore the Precision Peptide Genetic Test to see your pathway-level insights, then share them with your provider.

The Precision Peptide Genetic Test analyzes how your genes influence peptide-related biological pathways. It does not recommend, prescribe, or determine which peptides you should use. Consult a qualified healthcare provider before beginning any peptide protocol.

This article is part of the PlexusDx Education Hub. Browse all Respiratory & Immune Health education

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.