Silicosis and coal-worker pneumoconiosis

01OverviewDefinition, clinical context and the essential points that orientate the chapter.

Crystalline silica particles reach distal lung and provoke inflammation, nodular fibrosis and immune dysfunction. Traditional risks in mining and quarrying remain, while engineered-stone manufacture and installation create intense exposure when high-silica material is dry cut or polished. Acute silicoproteinosis resembles alveolar proteinosis and can advance quickly; accelerated silicosis develops after shorter high exposure; chronic disease may not become evident until years after work stops.

Coal-worker pneumoconiosis follows cumulative inhalation of coal-mine dust. Simple disease consists of small rounded opacities and may be minimally symptomatic, while progressive massive fibrosis causes large upper-zone lesions, distortion, breathlessness, hypoxaemia and pulmonary hypertension. Coal dust also contributes to chronic bronchitis, emphysema and COPD that may dominate physiology. Imaging must be interpreted by experienced radiology with exposure details, because sarcoidosis, healed infection and malignancy can mimic nodules or masses.

Prevention is more effective than treatment. Employers must assess and control exposure using the hierarchy of controls, and HSE health surveillance is intended to detect work-related effects in exposed workers; it is not a replacement for control. Once disease is suspected, respiratory and occupational-health teams define fitness and exposure advice. Care addresses smoking, vaccination, airflow obstruction, rehabilitation, oxygen and complications, alongside TB vigilance and access to benefits or compensation advice.

Key points

Pneumoconiosis describes diffuse lung disease caused by retained inhaled mineral dust; silicosis and coal-worker pneumoconiosis are important UK occupational examples.
Respirable crystalline silica arises from stone, rock, sand and clay, with high-risk tasks including cutting engineered stone, dry grinding, tunnelling, quarrying and sandblasting.
Silicosis may be chronic after long latency, accelerated after intense exposure over fewer years, or acute after very high exposure.
Chronic simple silicosis classically produces upper-lobe small nodules and sometimes eggshell nodal calcification; progressive massive fibrosis forms large conglomerate opacities.
Coal-mine dust can cause simple coal-worker pneumoconiosis, progressive massive fibrosis and COPD; smoking is an additional but not necessary cause of airflow obstruction.
Silica exposure and silicosis increase tuberculosis risk, so fever, weight loss, night sweats, haemoptysis or radiological change demands microbiological assessment.
No drug removes deposited dust or reliably reverses established fibrosis; prevention and cessation of harmful exposure are fundamental.
A disposable paper mask is not a substitute for elimination, wet cutting, extraction, enclosure and correctly selected respiratory protective equipment within a lawful control system.
Diagnosis requires a credible task-based exposure history, compatible imaging and exclusion of mimics such as sarcoidosis, infection, malignancy and other ILDs.
Specialist documentation supports occupational-health action and possible Industrial Injuries Disablement Benefit, but clinical diagnosis does not guarantee statutory eligibility.

02AetiologyUnderlying causes, associations and risk factors, with why each one matters.

Respirable crystalline silica

Cutting engineered stone, mining, quarrying, construction and abrasive blasting generate fine silica particles that penetrate distal lung.

Coal-mine dust

Cumulative inhalation of coal and mixed mineral dust causes coal-worker pneumoconiosis, with risk shaped by concentration, composition and years exposed.

High-intensity exposure

Very heavy silica exposure over a shorter period can produce accelerated or acute disease rather than the usual long latency.

Continued workplace control failure

Inadequate wet cutting, extraction, enclosure or respiratory protection permits ongoing exposure and disease progression among coworkers.

03PathophysiologyThe causal sequence from the underlying abnormality to symptoms and harm.

1
Particle deposition
Respirable mineral particles reach terminal bronchioles and alveoli, where macrophages attempt phagocytosis, which links the underlying lesion to the observed respiratory dysfunction.
2
Macrophage injury
Crystalline silica damages phagolysosomes, kills macrophages and releases inflammatory and fibrogenic mediators while particles are re-ingested.
3
Nodule formation
Activated fibroblasts deposit collagen around dust-laden macrophages, producing small upper-zone nodules that may coalesce, which links the underlying lesion to the observed respiratory dysfunction.
4
Progressive massive fibrosis
Confluent fibrotic masses distort airways and vessels, reduce lung volume and impair gas transfer even after exposure stops.

04Clinical features and red flagsSymptoms, examination findings, patterns of presentation and time-critical warnings.

Chronic simple silicosis

A worker with years of stone, quarry, foundry or tunnelling exposure has upper-zone small rounded nodules, sometimes with hilar-node eggshell calcification and relatively modest early symptoms.

Accelerated or acute silicosisRed flag

High-intensity exposure, particularly dry engineered-stone processing or sandblasting, is followed within a shorter latency by rapidly worsening cough, breathlessness, diffuse opacity or alveolar-filling disease.

Progressive massive fibrosis

Large upper-lobe conglomerate masses, architectural distortion, volume loss, hypoxaemia and pulmonary hypertension develop on a background of dust nodules and substantial exposure.

Coal-worker pneumoconiosis

A former or current coal miner has small upper-zone opacities or progressive massive fibrosis, with cough and breathlessness variably influenced by coexisting COPD and smoking.

Tuberculosis complicationRed flag

Fever, night sweats, weight loss, haemoptysis, cavitation or new focal change in silica-exposed disease requires urgent TB sampling, infection-control assessment and specialist notification pathways.

05InvestigationsWhat to request, why it matters and how to interpret it.

Investigation order

Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.

01
Task-based occupational historyFirst step
Why
Estimate dust type, intensity, duration, latency and current exposure.
Interpretation and limitations
Record materials and silica content, cutting method, visible dust, extraction, wet suppression, enclosure, respiratory protection, employer and dates. 'Construction' or 'miner' alone is insufficient.
02
Chest radiograph
Why
Identify small-opacity burden, large opacities and complications.
Interpretation and limitations
Upper-zone rounded nodules and nodal calcification support silicosis; coal disease may be similar. Comparison with previous films helps, but CT is needed for atypical or consequential findings.
03
High-resolution computed tomography
Why
Characterise nodules, progressive massive fibrosis, emphysema and mimics.
Interpretation and limitations
Distribution, calcification, conglomerate masses, lymph nodes and emphysema are assessed together. Cavitation or asymmetric enlargement prompts urgent tuberculosis and cancer evaluation.
04
Spirometry, lung volumes and TLCO
Why
Quantify obstruction, restriction, gas-transfer impairment and trajectory.
Interpretation and limitations
Simple radiographic disease can coexist with preserved physiology; COPD can produce obstruction, and progressive massive fibrosis may cause mixed severe impairment. Findings inform disability but not cause alone.
05
Tuberculosis microbiology and immune testing
Why
Detect active or latent TB in the appropriate exposure and clinical context.
Interpretation and limitations
Symptoms or imaging suspicion requires sputum molecular testing, smear and culture through the local TB service. An immune test does not distinguish active from latent infection and cannot replace microbiology.
06
Exercise oxygen and cardiac assessment
Why
Measure functional limitation and investigate pulmonary vascular complications.
Interpretation and limitations
Standardised walk desaturation supports oxygen and rehabilitation decisions. Disproportionate dyspnoea, syncope or oedema prompts ECG, echocardiography and specialist pulmonary-hypertension assessment.
07
Occupational-health and exposure-control review
Why
Prevent continuing disease and protect co-workers.
Interpretation and limitations
Review risk assessment, health-surveillance findings and control measures with competent occupational professionals. Clinical advice should not instruct unsafe self-sampling of workplace dust or materials.

06Differential diagnosisRealistic alternatives and the features that help distinguish them.

Sarcoidosis

Perilymphatic nodules and hilar nodes overlap, but occupational exposure, eggshell nodal calcification and dust-related pathology favour pneumoconiosis.

Pulmonary tuberculosis

Silica exposure increases tuberculosis risk; new constitutional symptoms or radiological change requires microbiology rather than attribution to fibrosis.

Chronic hypersensitivity pneumonitis

Organic antigen exposure, air trapping and bronchiolocentric inflammation distinguish immune pneumonitis from mineral-dust nodules, while chronology and directed testing distinguish the competing explanation.

Idiopathic pulmonary fibrosis

Basal subpleural UIP-pattern fibrosis without credible dust exposure differs from the usual upper-zone nodular occupational pattern.

Lung cancer

A new focal mass within distorted pneumoconiotic lung requires malignancy assessment because radiographic progression is not automatically benign fibrosis.

Additional chapter-specific clues

Malignancy or alternative diseaseRed flag

An enlarging asymmetric mass, nodal change, haemoptysis or systemic decline needs cancer and infection evaluation rather than automatic attribution to progressive massive fibrosis.

07ManagementImmediate care, first-line treatment, alternatives and escalation.

01DiagnosisLink the radiology to the real taskFirst stepNodular or fibrotic lung disease appears in a person with possible mineral-dust exposure.

1Assess respiratory stability and infectious red flags, then build a detailed exposure chronology covering materials, processes, visible dust and controls across every job and hobby.
2Obtain chest imaging, full pulmonary function and exercise oxygenation; ask thoracic radiology to distinguish small-opacity disease, progressive massive fibrosis, emphysema and suspicious focal lesions.
3Evaluate tuberculosis, sarcoidosis, fungal infection, malignancy and other ILD according to symptoms and imaging before confirming pneumoconiosis at specialist review.
4Document diagnosis, impairment and exposure evidence separately, explaining uncertainty and the plan for occupational-health and statutory support.

02Exposure controlPrevent further inhalationOngoing respirable silica or coal-dust exposure is possible.

1Advise temporary removal from hazardous exposure when disease is suspected and arrange prompt occupational-health review, balancing immediate safety with employment consequences.
2EscalationEscalate to competent workplace control: substitute or eliminate high-dust processes, use wet methods, local extraction, enclosure and correctly fit-tested respiratory protection as the final layer.
3Use HSE guidance and statutory reporting routes where relevant; a clinician should not design industrial controls beyond competence or tell a patient to collect hazardous samples.
4Ensure co-workers' risk is considered through occupational systems, because finding one accelerated case may indicate a failed shared control environment.

03Complication careManage TB, airflow obstruction and advanced fibrosisSymptoms, physiology or imaging show clinically important disease or deterioration.

1For TB symptoms or cavitation, institute infection-control assessment and obtain prompt sputum testing through the TB service; treat active or latent infection using current national and local protocols.
2Optimise coexisting COPD or asthma according to objective physiology, provide smoking cessation, vaccination and pulmonary rehabilitation, and assess oxygen when indicated.
3Investigate enlarging masses, haemoptysis and disproportionate decline for cancer, pulmonary hypertension or infection rather than labelling all change progressive massive fibrosis.
4Offer symptom and future-care support for advanced disease, and signpost Industrial Injuries Disablement Benefit or independent welfare advice without promising entitlement.

Key medicines and prescribing safety2 treatments · regimens, roles and cautions

Corrects hypoxaemia in acute silicoproteinosis, advanced progressive massive fibrosis or a superimposed respiratory complication.

Controlled oxygen

For acute hypoxaemia target 94–98% in most adults or 88–92% if at risk of hypercapnic respiratory failure, pending blood gases and an individual prescription.

Oxygen does not remove mineral dust or halt fibrosis. Long-term and ambulatory use requires formal assessment; increasing need should prompt investigation for tuberculosis, infection, malignancy, embolism or pulmonary hypertension.

Relieves airflow-obstruction symptoms when coal dust, smoking or airway disease produces a treatable obstructive component.

Inhaled bronchodilator for coexisting obstructive disease

Select the inhaler and licensed dose from objective COPD or asthma assessment, inhaler technique, current NICE guidance and the local formulary; there is no pneumoconiosis-specific bronchodilator regimen.

Do not infer COPD from breathlessness alone or expect bronchodilation to reverse fibrosis. Review technique, adherence, cardiovascular and antimuscarinic adverse effects and exacerbation history; avoid inhaled corticosteroid without the appropriate indication.

08ComplicationsImportant consequences, why they occur and why they matter clinically.

Progressive massive fibrosis

Coalescing lesions cause severe distortion, restriction or obstruction, respiratory failure and disability despite exposure cessation, and increasing the burden of otherwise local respiratory disease.

Tuberculosis and mycobacterial disease

Silica impairs macrophage antimycobacterial function, substantially increasing active tuberculosis and NTM risk, particularly when baseline cardiopulmonary reserve is limited.

Pulmonary hypertension

Fibrotic vascular loss and chronic hypoxia raise pulmonary resistance and can cause right-heart failure, and potentially prolonging treatment and functional recovery.

Chronic airflow limitation

Dust-related small-airway disease and emphysema add obstructive physiology even without smoking, and increasing the burden of otherwise local respiratory disease.

Occupational and financial harm

Loss of safe employment, compensation needs and risk to coworkers add major social consequences to irreversible respiratory disease.

09Monitoring and follow-upTreatment response, safety checks and longer-term review.

Follow symptoms, work exposure, oxygen saturation, FVC, FEV1 and TLCO at intervals determined by disease severity and recent rate of change.
Ask at each review about fever, night sweats, weight loss and haemoptysis, arranging urgent tuberculosis assessment rather than waiting for routine imaging.
Compare imaging when function or symptoms change, scrutinising cavitation, asymmetric mass enlargement and new nodes for infection or malignancy.
Reassess workplace controls and occupational-health recommendations; disease monitoring does not make continued uncontrolled exposure acceptable.
Measure exercise oxygenation and screen for pulmonary hypertension when functional decline is disproportionate to spirometry or radiographic burden.
Review smoking cessation, vaccination, pulmonary rehabilitation, benefits signposting, mood and work impact as part of continuing respiratory care.

10Special situationsVariants, exceptions and circumstances that change the usual approach.

Engineered stone changes the timeline

Very high silica exposure during dry fabrication can produce severe disease in younger workers after a much shorter latency than traditional chronic silicosis.

Eggshell calcification is not exclusive

Peripheral nodal calcification is a memorable silicosis clue but can occur in other diseases; it must be paired with credible task-based exposure.

Large opacities need scepticism

Progressive massive fibrosis can look mass-like, yet enlargement, cavitation or asymmetry still requires infection and cancer assessment rather than diagnostic anchoring.

Silica impairs host defence

Tuberculosis risk remains clinically important after exposure ends. Constitutional or respiratory change deserves active microbiological investigation, not only an immune screening test.

Surveillance is not control

Health surveillance may detect harm but cannot prevent it when dust exposure remains uncontrolled; engineering measures sit above respiratory protective equipment in the hierarchy.

11Common pitfallsFrequent interpretation and management errors.

01
Recording only 'worked in construction' and failing to ask about dry stone cutting, duration, extraction and respiratory protection.
02
Treating eggshell nodal calcification as diagnostic without considering sarcoidosis, healed infection and the exposure history.
03
Calling an enlarging upper-lobe mass progressive massive fibrosis without urgent tuberculosis and cancer evaluation.
04
Assuming a paper mask made high-intensity respirable silica exposure safe.
05
Prescribing corticosteroids routinely for established pneumoconiosis despite absent inflammatory indication and substantial infection risk.
06
Promising Industrial Injuries Disablement Benefit solely because a clinician has recorded silica or coal exposure.