The short answer
Vinyl chloride is a gas used to make PVC plastic. NCI says exposure raises the risk of a rare liver cancer, mainly in workers. NCI says PVC itself is not a known or suspected carcinogen.
NCI says vinyl chloride exposure raises the risk of a rare form of liver cancer, hepatic angiosarcoma.
NCI says workers at facilities that make or use it are exposed mainly by breathing it.
NCI also associates it with hepatocellular carcinoma, brain and lung cancers, lymphoma, and leukemia.
A carcinogen classification describes hazard — whether something can cause cancer — not your personal risk at a given exposure.
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The simple version
Vinyl chloride is a man-made gas used to make PVC, a common plastic. NCI says exposure raises the risk of a rare liver cancer. NCI says PVC itself is not a known or suspected carcinogen.
What vinyl chloride is
Vinyl chloride is the main material used to make polyvinyl chloride, or PVC. NCI says PVC is used in pipes, wire and cable coatings, and packaging materials. The concern is the gas, not the finished plastic.
How people are exposed
Most people never meet the gas. Those who do are usually exposed through:
- Working in plants that make or use vinyl chloride. NCI says this is mainly by breathing it.
- Breathing contaminated air.
- Contaminated water. NCI says vinyl chloride can enter household air when the water is used for showering, cooking, or laundry.
- Tobacco smoke. NCI says vinyl chloride is also made when tobacco burns.
The cancer connection
NCI says vinyl chloride exposure raises the risk of a rare form of liver cancer, hepatic angiosarcoma. NCI also associates it with primary liver cancer (hepatocellular carcinoma), brain and lung cancers, lymphoma, and leukemia.
Hazard is not the same as risk
A carcinogen label is about hazard. It says a substance can cause cancer under some conditions. Your own risk is a separate question. It depends on how much of the gas you breathe, for how long, and on other factors. NCI says PVC itself is not a known or suspected carcinogen.
How to lower your exposure
- If you work with vinyl chloride, ask your employer about safety rules and exposure limits.
- If you live near an industrial site and worry about your water or air, ask your local health department.
- Do not smoke. NCI says tobacco smoke is one source.
Keeping clear of the gas is one part of a much larger picture. Our overview of cancer prevention and what raises cancer risk cover the rest of it.
The bottom line
NCI says vinyl chloride exposure raises the risk of a rare liver cancer. The useful step is to learn where your own exposure could come from, then ask your care team or employer how to reduce it.
Sources
Common questions
Does vinyl chloride cause cancer?
NCI says exposure raises the risk of hepatic angiosarcoma, a rare liver cancer. How much any one person's risk rises depends on how much they are exposed to and for how long.
How are people exposed to vinyl chloride?
NCI says workers at facilities where it is made or used are exposed mainly by breathing it. The general population may be exposed by breathing contaminated air or tobacco smoke.
Which cancers are linked to vinyl chloride?
NCI links it to hepatic angiosarcoma and hepatocellular carcinoma, which are liver cancers. NCI also associates it with brain and lung cancers, lymphoma, and leukemia.
How can I reduce my exposure to vinyl chloride?
If you work around it, ask your employer about safety rules and exposure limits. If you live near an industrial site and have concerns about your water or air, ask your local health department.
Does a carcinogen label mean I will get cancer?
No. A classification is about hazard — whether vinyl chloride can cause cancer under some conditions — not a prediction that any one exposed person will develop cancer. Your actual risk depends on the amount and length of exposure and other factors.
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Last updated: 2026-10-16Next planned review: 2028-07-05
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Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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