What Are The Signs of Asbestos Exposure?

The first signs of asbestos exposure are the symptoms of related diseases. There are no signs of asbestos exposure that a person could identify before a disease develops.

Signs of asbestos exposure usually involve the lungs. That’s because asbestos primarily causes lung diseases.

Signs of Asbestos Exposure Affecting the Lungs

  • Shortness of breath
  • Dry cough or wheezing
  • Crackling sound when breathing
  • Chest pain or tightness
  • Respiratory complications
  • Pleural effusion (accumulation of fluid in the space surrounding a lung)
  • Pleural plaques
  • Pleural thickening
  • Asbestosis

Asbestos also causes diseases in other parts of the body. The signs of those diseases primarily affect the throat, stomach and colon.

Signs of Asbestos Exposure Affecting Other Parts of the Body

  • Abdominal swelling and distention
  • Abdominal or pelvic pain
  • Bowel obstruction
  • Hernia
  • Weight loss
  • Loss of appetite
  • Hoarseness
  • Difficulty swallowing
  • Clubbed fingers

In some instances, a routine X-ray or CT scan may identify pleural plaques. These plaques signal that enough exposure happened to cause other asbestos-related diseases. But pleural plaques aren’t a sign that any person can watch out for because they rarely cause symptoms. Plaques begin to develop 10 to 30 years after exposure.

Diseases Caused by Asbestos Exposure

Exposure to asbestos causes cancerous and noncancerous diseases. The International Agency for Research on Cancer (IARC) has confirmed that asbestos causes cancer.

Cancers Caused by Asbestos Exposure

The noncancerous conditions caused by asbestos exposure primarily affect the lungs or the pleural lung lining.

Noncancerous Diseases and Conditions Caused by Asbestos Exposure

  • Asbestosis
  • Pleural plaques
  • Pleural thickening
  • Benign pleural effusion
  • Pleuritis
  • Atelectasis

The IARC also found an increased risk of other cancers but hasn’t proven a direct causal relationship. These include stomach cancer, pharyngeal cancer and colorectal cancer.

Occupational exposure is the No. 1 cause of asbestos-related disease. Secondary exposure can cause all of these conditions, too.

Dr. Jacques Fontaine and Dr. Virginia Wolf
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Screening for Asbestos-Related Diseases

Asbestos-related diseases rarely produce noticeable symptoms in the early stages of development. Screening for these conditions before symptoms arise is difficult and often ineffective.

However, if you have a history of heavy asbestos exposure, screening for mesothelioma and other asbestos-related diseases could save your life. There’s no single screening that can conclusively detect mesothelioma. A combination of tests may help doctors find potential problems before they start to cause symptoms.

Tell your doctor if you have a history of asbestos exposure or have experienced symptoms of asbestos exposure, and ask for recommended screenings.

Screening Procedures for Asbestos-Related Diseases

  • Chest X-ray
  • Low-dose CT scan
  • Spirometry
  • Bronchoscopy
  • Bronchoalveolar lavage
  • Pulmonary function tests

The American Academy of Family Physicians recommends a chest X-ray and pulmonary function tests every three to five years for patients with noncancerous asbestos disease. These tests might catch cancerous changes in the chest, but are not entirely reliable.

Researchers are developing blood tests for mesothelioma. Others are developing tests for biomarkers of asbestos exposure. These tests are not accurate enough yet to detect signs of asbestos exposure or mesothelioma.

Transvaginal ultrasound and a blood test for the CA-125 protein may be used as screening tools for ovarian cancer.

Risk of Developing Asbestos-Related Diseases

Approximately 20% of people who work with asbestos develop a related disease. Some heavily exposed groups have reported even higher rates.

  • 6% to 10% develop mesothelioma
  • 20% to 25% develop lung cancer
  • 50% of heavily exposed groups develop asbestosis

Many factors are involved in the risk of developing an asbestos-related disease. How long a person was exposed plays a major role. So does the concentration of asbestos fibers they inhaled.

Most people who get sick worked heavily with asbestos for most of their careers.

All types of asbestos cause these diseases. Some fibers appear to be more carcinogenic such as crocidolite (blue asbestos).

Genetics and lifestyle choices, such as smoking cigarettes or using talcum powder, are contributing risk factors for some of these conditions.

The combination of smoking and asbestos exposure significantly increases the risk of lung cancer but not mesothelioma. Smoking can worsen the progression of asbestosis.

Sometimes, noncancerous conditions develop before asbestos cancers. They are not a reliable sign that cancer will develop, but they do indicate a high level of exposure that is associated with asbestos cancers.

Pleural Plaques Signal Significant Exposure

Pleural plaques are the most common sign of significant asbestos exposure. They may develop before or alongside other asbestos-related diseases.

A 2013 French study published in the Journal of the National Cancer Institute studied pleural plaques and the risk of mesothelioma. It tracked more than 5,000 asbestos workers and reported the following observations:

  • Pleural plaques were found in 20.4% of workers.
  • About 7.4% of workers with one to nine years of asbestos exposure developed pleural plaques.
  • More than 50% of workers with 40 or more years of experience developed plaques.
  • Workers with pleural plaques were approximately six to nine times more likely to later develop mesothelioma.

Not everyone with plaques will develop another related disease. But it’s important for people with pleural plaques to monitor their health with the help of a doctor.


Asbestosis is a noncancerous progressive lung disease that leads to severe lung dysfunction. It does not turn into cancer. An asbestosis diagnosis indicates a person had enough exposure to also be at risk of asbestos-related cancers, particularly lung cancer.

A 2021 study published in the American Journal of Industrial Medicine reported the highest rates of asbestosis occur in construction workers. Other occupations associated with higher rates of asbestosis included insulators, pipefitters, plumbers and carpenters. Those who work in welding, boiler manufacturing, auto repair and machinery repair also had elevated rates of asbestosis.

It is less common for asbestosis patients to develop mesothelioma, but it is possible. A 2017 study published in the journal Safety and Health at Work found no clear trends between the incidence of asbestosis and mesothelioma.

A 2013 study published in the American Journal of Respiratory and Critical Care Medicine studied asbestosis and lung cancer among asbestos insulators. It found people with asbestosis were 7.4 times more likely to develop lung cancer.

The Agency for Toxic Substances and Disease Registry reports that many asbestosis patients die of other causes. About 9% die of mesothelioma and 38% die of lung cancer.

Pleural Thickening

Pleural thickening is a noncancerous condition that is associated with heavy asbestos exposure. It does not run the risk of turning cancerous, but it may develop before some cases of mesothelioma.

Interestingly, a 1988 study of Australian crocidolite miners found an increased risk of peritoneal mesothelioma — not pleural mesothelioma — among those with pleural thickening.

Common Questions About Signs of Asbestos Exposure

How long can it take for disease relating to asbestos exposure to show up?

Symptoms of an asbestos-related disease typically don’t appear until about 40 years after exposure. This asbestos latency period can make a mesothelioma diagnosis difficult since patients may not have symptoms until the disease is in its advanced stages.

What are the signs and symptoms of asbestos exposure?

Signs of mesothelioma and other asbestos-related diseases most commonly include:

  • Shortness of breath
  • Pain in the chest or abdomen
  • Fatigue or general weakness
  • Fever or night sweats
  • Dry cough
How Much Asbestos Exposure Is Safe?

According to the World Health Organization (WHO), no level of asbestos exposure is safe. Excess rates of cancers are found at all asbestos fiber concentrations. This means that there is no evidence for a safe level of asbestos exposure.

Is there a test for asbestos exposure?

There is no single test to confirm asbestos exposure, but diagnostic tests for asbestos-related diseases effectively serve this purpose. Mesothelioma doctors assume the patient was exposed to asbestos when an examination reveals an asbestos-related condition.