Why firefighters face higher cancer risk, and what helps

This page is for firefighters and the people who love them. It explains how much firefighting raises cancer risk, what drives it, and what you can do.

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.

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. NIOSH published the detailed figures so the risk would not be misstated. A 9% increase is a real signal worth acting on, and it is smaller than some coverage suggests.

A real, moderate rise in risk is exactly the kind of finding that prevention work can act on.

Why is the risk higher? The answer starts with what the job puts you in contact with. 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

CDC also lists ergonomic and heavy-weight hazards. 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.

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. CDC describes the registry as a registry to study cancer among firefighters.

CDC points to the National Firefighter Registry for Cancer as a way to better understand and reduce cancer in the fire service. The registry is a research effort. It is not a screening program, so it is not a substitute for a medical check.

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.

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. A 9% increase in diagnoses is a modest change from the expected rate. 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.

• CDC/NIOSH, Firefighters, accessed August 13, 2026
• NIOSH Science Bulletin, Firefighter Cancer Rates: The Facts from NIOSH Research, accessed August 13, 2026