Welding fume exposure induces acute-phase proteins, cytokines, and neutrophilic responses in respiratory immune activationWelding fumes trigger immune responses and airway inflammation

Frontiers in Medicine Published August 21, 2026 DOI ↗ Editorial oversight: Dr. Amelia Tan, PhD · Internal Medicine & Chronic Disease

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Key Takeaway

Note that welding fumes can trigger acute-phase proteins, cytokines, and neutrophilic responses in the respiratory tract.

This mini review synthesizes evidence from human studies, controlled inhalation studies, cell models, and workplace investigations to evaluate the impact of welding fume exposure on respiratory immune activation. The authors conclude that metal-rich particles in welding fumes can induce acute-phase proteins, cytokines, chemokines, and neutrophilic responses. Additionally, some studies indicate that these exposures may lead to altered T helper cell activity and weakened responsiveness to bacterial stimuli.

The review also explores the role of TRPA1 and TRPV1 mediated sensory signaling as a potential rapid route for cough and acute airway reflex responses. However, the authors note that direct welding-fume-specific human evidence for this specific signaling pathway is currently limited. The synthesis suggests an association between exposure and immune activation rather than a definitive causal link.

Several limitations are noted, including significant variability in fume composition, particle size, and soluble metal fractions. Confounding factors such as smoking, infection, and co-exposures may also influence results. Longitudinal evidence is limited. These findings suggest that monitoring inflammatory and host-defense markers may help identify biologically active residual exposure and clarify the extent of airway immune perturbation in exposed individuals.

When workers breathe in metal-rich particles from welding, their bodies may react more than just by causing a simple cough. A review of various studies found that these fumes can trigger specific immune responses. These include an increase in inflammatory markers like cytokines and chemokines, which are signals the body uses to respond to irritation.

The research also suggests that these fumes might weaken the body's defenses. Some evidence shows that welding exposure can alter T helper cell activity and make it harder for the body to react to bacterial threats. This means the respiratory system is not just irritated; its ability to protect itself from germs could be compromised.

While some studies suggest a rapid pathway for coughing through specific sensory signals, there is currently limited evidence specifically linking these pathways to welding fumes in humans. Because factors like particle size and smoking can change how the body reacts, more research is needed to understand exactly how different types of welding fumes affect workers over time.

What this means for you:

Welding fumes can trigger inflammatory markers and potentially weaken your respiratory system's defense against bacteria.

Common questions

How do welding fumes affect the lungs?

Welding fumes containing metal-rich particles can cause your immune system to activate. This leads to an increase in inflammatory markers like cytokines and chemokines, as well as neutrophilic responses. These are signals that indicate the body is reacting to irritation or potential harm in the airways.

Can welding fumes make it harder to fight infections?

Yes, some studies show that exposure to these fumes can alter T helper cell activity and weaken how your body responds to bacterial stimuli. This means the respiratory system's ability to defend itself against germs could be weakened after exposure.

What are the risks of long-term welding fume exposure?

While some studies show immediate immune activation, there is currently limited longitudinal evidence regarding long-term effects. Factors like particle size and other exposures also play a role in how your body reacts to these fumes over time.

Study Details

Study typeSystematic review

EvidenceLevel 1

PublishedAug 2026

View Original Abstract ↓

Welding fumes are widely recognized occupational aerosols, yet their effects on respiratory immune pathways remain incompletely integrated into exposure-oriented assessment. Generated by welding materials, process parameters, surface conditions, and ventilation, welding fumes contain fine and ultrafine particles that can deposit in the respiratory tract and interact with epithelial cells, alveolar macrophages, neutrophils, monocytes, and circulating immune cells. This Mini Review examines welding fume exposure as a metal-particle stimulus to the respiratory immune system, focusing on how metal-rich particles initiate oxidative and epithelial–innate immune responses, what inflammatory and host-defense markers reveal about early biological effects, and how such evidence can be interpreted alongside exposure assessment. Evidence from human exposure studies, controlled inhalation studies, cell models, and workplace investigations suggests that welding fumes can induce acute-phase proteins, cytokines, chemokines, and neutrophilic responses, while some studies also indicate altered T helper cell activity and weakened responsiveness to bacterial stimuli. Evidence from related metal and particulate models further suggests that TRPA1/TRPV1-mediated sensory signaling may provide a rapid route to cough and acute airway reflex responses, although direct welding-fume-specific human evidence remains limited. However, interpretation remains constrained by differences in fume composition, particle size, soluble metal fraction, exposure pattern, smoking, infection, co-exposures, and limited longitudinal evidence. These findings support an immune-informed view of welding fume exposure in which inflammatory and host-defense markers help identify biologically active residual exposure. Such markers should not replace exposure limits or engineering controls, but they may strengthen the interpretation of airway immune perturbation in occupational metal-particle exposure.

Welding fume exposure induces acute-phase proteins, cytokines, and neutrophilic responses in respiratory immune activationWelding fumes trigger immune responses and airway inflammation

Common questions

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Welding fume exposure induces acute-phase proteins, cytokines, and neutrophilic responses in respiratory immune activationWelding fumes trigger immune responses and airway inflammation

Common questions

Study Details

Budesonide-glycopyrronium-formoterol fumarate dihydrate improved lung function and reduced severe exacerbations versus budesonide-formoterol in inadequately controlled asthma

New Asthma Drug Cuts Attacks Without Recent Crisis

Clinical research that matters. Delivered to your inbox.

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