Asbestos exposure can cause several serious diseases, including cancers of the lung, larynx, and ovary, a rare cancer called mesothelioma, and a chronic scarring condition of the lungs called asbestosis. It can also cause non-cancerous changes to the lining around the lungs. These conditions often take decades to appear after the initial exposure, which is part of what makes asbestos so dangerous: by the time symptoms show up, significant damage has already occurred.
How Asbestos Damages the Body
Asbestos fibers are microscopic, needle-like structures that can be inhaled deep into the lungs. Once lodged in lung tissue or the thin membrane surrounding the lungs (called the pleura), these fibers trigger a chain of damage at the cellular level. The iron on the surface of asbestos fibers drives chemical reactions that produce highly reactive oxygen molecules. These molecules damage DNA and activate multiple stress-response pathways inside cells, setting the stage for both scarring and cancer.
The body cannot break down or dissolve asbestos fibers. They remain embedded in tissue indefinitely, causing ongoing irritation and inflammation that compounds over years and decades.
Mesothelioma
Mesothelioma is the disease most closely linked to asbestos and is almost exclusively caused by it. This cancer develops in the mesothelium, a thin tissue layer that lines the chest cavity, abdominal cavity, or, rarely, the heart. It is aggressive and typically diagnosed at an advanced stage.
The latency period for mesothelioma is exceptionally long. Most cases are diagnosed 20 to 30 years after the first exposure, though the minimum observed latency is about 14 years. This means someone exposed in their 20s or 30s may not develop symptoms until retirement age. The International Agency for Research on Cancer (IARC) classifies asbestos as a confirmed cause of mesothelioma, with sufficient evidence in humans.
Lung Cancer
Asbestos is a well-established cause of lung cancer, independent of smoking. The minimum latency for asbestos-related lung cancer is roughly 19 years. Unlike mesothelioma, lung cancer from asbestos looks identical to lung cancer caused by other factors, which can make it harder to connect to a past exposure.
Smoking dramatically worsens the risk. Research has shown that asbestos exposure multiplies the risk of lung cancer by a similar factor whether someone smokes or not, meaning the two hazards compound each other. A smoker with significant asbestos exposure faces a far higher risk than either hazard would produce on its own. If you have a history of asbestos exposure, quitting smoking is one of the most impactful things you can do to lower your cancer risk.
Laryngeal and Ovarian Cancer
Beyond the lungs and pleura, asbestos exposure has been linked to cancers in less expected locations. IARC has concluded there is sufficient evidence that asbestos causes cancer of the larynx (voice box) and cancer of the ovary. These classifications carry the highest level of scientific confidence.
For laryngeal cancer, the overall estimated relative risk from asbestos exposure is about 1.4, meaning exposed workers are roughly 40% more likely to develop it. Some studies of heavily exposed workers found risks two to four times higher than the general population. For ovarian cancer, the picture is similar: among workers with the highest exposure levels, the estimated relative risk reached 2.78, nearly triple the expected rate. One study of women working directly with asbestos found ovarian cancer rates more than five times higher than expected.
Asbestosis
Asbestosis is a chronic, non-cancerous lung disease caused by inhaling asbestos fibers over a prolonged period. It is defined as diffuse scarring (fibrosis) of the lung tissue as a direct consequence of asbestos dust exposure. As scar tissue builds up, the lungs become stiffer and less efficient at transferring oxygen into the bloodstream. Symptoms include progressive shortness of breath, a persistent dry cough, and reduced exercise tolerance.
Asbestosis can look nearly identical to other forms of lung scarring on imaging, which is why a documented history of asbestos exposure is essential for diagnosis. On a CT scan, the scarring typically appears in the lower portions of the lungs, with characteristic patterns near the lung surface. In advanced cases, the lung tissue develops a honeycomb-like appearance. There is no treatment that reverses the scarring. Management focuses on easing symptoms and slowing progression.
Non-Cancerous Pleural Disease
The most common result of asbestos exposure is not cancer or asbestosis but pleural plaques, which are patches of thickened, hardened tissue on the lining of the chest wall. About 60% of people with significant asbestos exposure develop them. Pleural plaques are typically asymptomatic and are usually discovered incidentally on a chest X-ray or CT scan done for another reason. They do not require treatment and are not cancerous, but they serve as a marker that meaningful asbestos exposure has occurred.
Other non-cancerous pleural conditions include diffuse pleural thickening, which can restrict how fully the lungs expand, and benign pleural effusions, which involve fluid buildup between the lung and chest wall.
Who Is Still at Risk
While large-scale industrial use of asbestos has declined, exposure still happens. Construction workers, electricians, plumbers, and demolition crews working in buildings built before the 1980s are among those most commonly exposed today, since asbestos was widely used in insulation, floor tiles, roofing materials, and pipe cement. The current OSHA workplace limit is 0.1 fiber per cubic centimeter of air, averaged over an eight-hour shift.
In March 2024, the EPA finalized a rule banning all ongoing uses of chrysotile asbestos, the only form still imported into the United States. The ban takes effect on different timelines depending on the industry. Some uses, like automotive brake components, were banned within six months. The chlor-alkali industry, which used asbestos in chemical processing equipment, faces a phased transition of up to 12 years for facilities converting multiple plants.
Take-Home Exposure
You don’t have to work with asbestos directly to be affected. A CDC-supported review of over 200 published articles identified nearly 60 that described asbestos-related disease in household contacts of exposed workers. Fibers carried home on work clothing, shoes, and hair exposed family members, particularly spouses who handled laundry. Over 65% of these cases involved households of miners, shipyard workers, insulators, or asbestos product manufacturers. In 98% of the cases where lung tissue was analyzed, amphibole asbestos (the more durable fiber type) was found.
Why Latency Matters
The gap between exposure and disease is the defining feature of asbestos-related illness. Someone exposed decades ago with no current symptoms is not necessarily in the clear. Mesothelioma can surface 30 or more years later. Lung cancer requires at least 19 years. Asbestosis develops gradually over many years of cumulative fiber exposure.
If you know or suspect you were exposed to asbestos, whether through your own work or through a family member’s, that information is worth sharing with your doctor. Imaging and lung function tests can detect early signs of asbestos-related changes before symptoms become severe, and awareness of the exposure history helps distinguish asbestos-related disease from other conditions that look similar on a scan.