Berylliosis (Chronic Beryllium Disease)

What berylliosis is

Beryllium is a light, strong metal used in alloys (often beryllium-copper), ceramics and electronic components. When beryllium particles are inhaled, most people tolerate them, but a proportion of exposed workers develop an immune memory to beryllium, called sensitization. This is linked to genes, particularly a variant of the HLA-DPB1 gene.

In sensitized people, immune cells react to beryllium in the lungs and form granulomas. Over time these can cause inflammation and scarring (fibrosis) that stiffens the lungs and reduces oxygen transfer.

There are three forms:

• Beryllium sensitization: a positive blood test without lung disease. Some people progress to CBD each year
• Chronic beryllium disease: granulomas and lung damage. It can appear months to more than 30 years after exposure, and even after small exposures
• Acute beryllium disease: a chemical pneumonitis from very high exposure, now rare because of workplace controls

Who is at risk

Exposure happens through machining, grinding, cutting, melting or polishing beryllium-containing materials, and through recycling of electronics and scrap metal. At-risk industries include:

• aerospace and defense
• nuclear weapons and power
• electronics and telecommunications
• dental laboratories (beryllium-containing dental alloys)
• metal production, foundries and recycling
• ceramics manufacturing

Family members can be exposed to dust carried home on clothing. Sensitization can occur with low-level exposure, so even indirect exposure matters.

Symptoms

Symptoms develop gradually:

• shortness of breath, first on exertion
• dry cough
• tiredness
• chest pain or tightness
• weight loss and loss of appetite
• fever or night sweats
• in advanced disease, finger clubbing and signs of heart strain

Granulomas can also affect the skin (red bumps, especially where beryllium entered a cut), liver, lymph nodes and occasionally other organs.

Berylliosis vs sarcoidosis

Chronic beryllium disease and sarcoidosis look almost identical on CT scans and under the microscope. Studies have found that a meaningful share of people diagnosed with sarcoidosis in some regions actually have unrecognized CBD.

Anyone diagnosed with sarcoidosis should be asked about past jobs and possible beryllium exposure.

Diagnosis

1. Occupational history: every job, hobby and household exposure
2. Beryllium lymphocyte proliferation test (BeLPT): a blood test showing whether white blood cells react to beryllium. Two abnormal results confirm sensitization
3. Chest CT: small nodules, thickened airways, enlarged lymph nodes and later scarring
4. Lung function tests: may show reduced lung volumes, reduced gas transfer, or airflow obstruction
5. Bronchoscopy: a camera into the airways to wash out cells for BeLPT and take lung biopsies showing granulomas

Treatment

• Stop exposure: move away from any further beryllium contact, which may require a job change. Workplace health programs and workers' compensation can help
• Monitoring: people with sensitization or mild CBD without symptoms are followed with lung function tests and scans, often every 1 to 3 years
• Corticosteroids: such as prednisone for symptoms or declining lung function, then tapered to the lowest effective dose
• Steroid-sparing medicines: methotrexate, azathioprine or mycophenolate for long-term control with fewer steroid side effects
• Oxygen therapy if blood oxygen is low
• Pulmonary rehabilitation, vaccinations against flu, pneumococcus and COVID-19, and not smoking
• Lung transplant for rare cases of end-stage disease

Complications

• pulmonary fibrosis (permanent lung scarring)
• pulmonary hypertension and right-sided heart failure
• respiratory failure, as in other forms of interstitial lung disease
• side effects from long-term steroids
• beryllium is classed as a human carcinogen, and exposure is linked to an increased risk of lung cancer

Prevention

Employers in the US must follow OSHA's beryllium standard, which sets exposure limits and requires:

• engineering controls such as ventilation and enclosed processes
• respirators and protective clothing where needed
• changing rooms and showers so dust is not carried home
• medical surveillance, including BeLPT testing, for exposed workers

Workers should report symptoms early and ask for BeLPT screening if they have been exposed.

Outlook

Berylliosis is a chronic disease. Outcomes vary widely: many people stay stable for years, especially with early diagnosis and no further exposure, while others progress to fibrosis despite treatment. Regular monitoring allows treatment to start before significant lung damage.

Frequently asked questions

What is berylliosis?

Berylliosis, or chronic beryllium disease, is a lung disease caused by an immune reaction to inhaled beryllium dust or fumes. It forms granulomas in the lungs that can lead to scarring, breathlessness and cough. It mainly affects workers in aerospace, electronics, defense, nuclear and dental industries.

How is berylliosis diagnosed?

Diagnosis combines a history of beryllium exposure, a positive beryllium lymphocyte proliferation test (BeLPT) on blood or lung fluid, and evidence of granulomas, usually from a lung biopsy during bronchoscopy. CT scans and lung function tests show the extent of disease.

Is berylliosis the same as sarcoidosis?

No, but they look almost identical on scans and biopsies. The difference is the cause: berylliosis is triggered by beryllium and has a positive BeLPT test. People diagnosed with sarcoidosis who have any history of beryllium exposure should be tested.

Can berylliosis be cured?

There is no cure, but it can be controlled. Stopping exposure and treatment with steroids or other immune-suppressing medicines slow or stop progression in many people. Early diagnosis through workplace screening gives the best chance of preserving lung function.

How long after exposure does berylliosis develop?

It can develop anywhere from a few months to more than 30 years after first exposure, and can occur even after exposure has stopped. Anyone with past beryllium exposure and new breathing symptoms should tell their doctor about it.