The short answer
CDC states that cancer is a leading cause of death among firefighters. A NIOSH study of nearly 30,000 career firefighters found a 9% increase in cancer diagnoses and a 14% increase in cancer deaths compared with expected US rates. CDC says good work practices may help lower exposure to cancer-causing substances.
CDC states cancer is a leading cause of death among firefighters.
NIOSH studied nearly 30,000 career firefighters employed between 1950 and 2009.
That study found a 9% increase in cancer diagnoses and a 14% increase in cancer deaths.
Exposures include chemicals in smoke and debris, firefighting products, and diesel and gasoline exhaust.
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The full explanation.
The plain answer
Firefighting carries a higher cancer risk than the average job, and you can measure it. Federal researchers have put numbers on it. CDC states that cancer is a leading cause of death among firefighters.
The size of the increase is smaller than some coverage suggests. Knowing the real figure is more use than knowing the frightening version.
What the NIOSH study found
The figures below come from NIOSH's own science bulletin on firefighter cancer rates, rather than from the CDC firefighter page listed as this article's source.
Researchers at NIOSH followed nearly 30,000 career firefighters. These were people employed at any time between 1950 and 2009 in Chicago, Philadelphia and San Francisco. The team compared what happened to those firefighters with what would be expected in the US population.
The results were:
- A 9% increase in cancer diagnoses.
- A 14% increase in cancer deaths.
NIOSH itself flagged a problem. Recent media reports had confused the issue by over-stating the cancer risk for firefighters. A 9% increase is a real signal worth acting on. It is not the doubling or tripling that sometimes gets quoted.
A real, moderate rise in risk is exactly the kind of finding that prevention work can act on.
What firefighters are exposed to
CDC describes firefighting environments as exposing workers to gases, vapours and particulates. Some of those are known or suspected to cause cancer. The hazard groups it lists are:
- Chemicals in smoke and debris
- Chemical products used in firefighting
- Gasoline and diesel exhaust
- Physical hazards, including heat stress and noise
- Shift work and sleep disruption
- Traumatic events
Not all of these are cancer hazards, and CDC does not say they are. They appear together because they describe the whole job. That whole picture is worth seeing.
What can reduce the risk
CDC's wording here is careful rather than salesy. Good work practices may help lower firefighter exposure to cancer-causing substances.
The word "exposure" is the key. A fire service cannot pull a lever on cancer itself. It can pull one on how much hazardous material reaches a firefighter's skin, lungs and gear. Cut the contact and you cut the input.
CDC also points to the National Firefighter Registry for Cancer. It describes the registry as an effort to better understand and reduce cancer in the fire service. Registries work slowly. But they are how a scattered job-related risk finally becomes documented and something you can act on.
If you or someone you love does this work
A few things follow from what CDC says.
First, your work history is medical information. A clinician who does not know what you do for a living is working with a piece missing.
Second, the hazards on that list that are not about cancer deserve attention too. Sleep disruption and traumatic exposure harm health in their own right. They are easier to raise if you treat them as part of the job rather than as personal weakness.
Third, being in a higher-risk group is not a diagnosis or a forecast. Most firefighters do not develop cancer, and the study's own numbers say so. The evidence supports taking exposure seriously during your working years. It does not support living in dread of an outcome that is far from certain.
If you are worried, the best next step is a talk with a clinician who knows your service history. What you fought. For how long. With what protection.
Why registries are worth taking seriously
Research on job-related cancer is slow, for a frustrating reason. Decades can pass between the exposure and the illness. A firefighter's working conditions in one year may only show up in the statistics much later.
That gap is why CDC points to the National Firefighter Registry for Cancer, and describes it as a way to better understand and reduce cancer in the fire service. Registries build the long-term picture that a single department cannot see on its own.
Taking part is not a health check. It will not tell you anything about your own body. It adds to the evidence that later shapes equipment standards and decontamination practice. In many places it also shapes what counts as a work-related illness for compensation.
If you work in the fire service, here is the practical thing you can do today. Keep your own record of major exposures. A note written at the time is worth far more than memory years later.
Sources
- CDC/NIOSH, Firefighters, accessed August 13, 2026
- NIOSH Science Bulletin, Firefighter Cancer Rates: The Facts from NIOSH Research, accessed August 13, 2026
Words to know
Tap any term to see what it means.
Common questions
How much higher is a firefighter's cancer risk?
In the NIOSH study of career firefighters from Chicago, Philadelphia and San Francisco, cancer diagnoses were 9% higher and cancer deaths were 14% higher than expected for the US population. NIOSH noted that some media reports had over-stated firefighters' cancer risk, so the measured increase is real but modest.
What exactly are firefighters breathing in?
CDC lists chemicals in smoke and debris, chemical products used in firefighting, and gasoline and diesel exhaust. It notes that firefighting environments expose workers to gases, vapours and particulates, some known or suspected to cause cancer.
Is there a registry a firefighter can join?
Yes. CDC describes the National Firefighter Registry for Cancer as an effort to better understand and reduce cancer in the fire service. It is a research effort rather than a screening programme.
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Sources last checked: 2026-08-13 what this meansLast updated: 2026-08-18Next planned review: 2027-08-11
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How this page was created
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 checked line by line against the sources listed on it. That confirms the sources support what the page says. 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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