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Cancer Risk and Prevention

Agent Orange and Cancer Risk

What is Agent Orange? 

Agent Orange was a mixture of plant-killing chemicals (herbicides) used by the United States military during the Vietnam War as a defoliant to remove tree cover, destroy crops, and clear vegetation around US bases. About 3 million Americans served in the armed forces in Vietnam and nearby areas. Many of these veterans, as well as other people in the area, were exposed to Agent Orange.

Exposure to Agent Orange could have occurred when the chemicals were breathed in, ingested in contaminated food or drinks, or absorbed through the skin. Exposure might have been possible through the eyes or through breaks in the skin, as well.

One of the challenges in assessing the health effects of Agent Orange exposure has been determining how much an individual was exposed to (or even what they were exposed to). Very little information on this is available.

Does Agent Orange cause cancer?

In general, the American Cancer Society does not determine if something causes cancer (that is, if it is a carcinogen), but we do look to other respected organizations for help with this. Based on current research, some of these organizations have made the following determinations:

International Agency for Research on Cancer (IARC)

The International Agency for Research on Cancer (IARC) is part of the World Health Organization. One of its major goals is to identify causes of cancer.

IARC has classified one of the chemicals in Agent Orange (2,3,7,8-TCDD, also sometimes referred to as “dioxin”) as “known to be carcinogenic to humans.”

US National Toxicology Program (NTP)

The US National Toxicology Program (NTP) is an interagency program that includes the National Institutes of Health (NIH), the Centers for Disease Control and Prevention (CDC), and the Food and Drug Administration (FDA).

The NTP has classified one chemical in Agent Orange (2,3,7,8-TCDD, also sometimes referred to as “dioxin”) as “known to be a human carcinogen.”

To learn more about how these organizations study and classify cancer causes, see Determining if Something Is a Carcinogen and Known and Probable Human Carcinogens.

US National Academies of Sciences, Engineering, and Medicine (NASEM)

The US National Academies of Sciences, Engineering, and Medicine (NASEM) has linked exposure to Agent Orange (and some other herbicides) to certain cancers and cancer precursors in its most recent report, Veterans and Agent Orange: Update 11 (2018):

Sufficient evidence of an association

  • Soft tissue sarcoma
  • Non-Hodgkin lymphoma (NHL)
  • Hodgkin lymphoma
  • Chronic lymphocytic leukemia (CLL), including hairy cell leukemia and other chronic B-cell leukemias
  • Monoclonal gammopathy of undetermined significance (MGUS), a precursor of multiple myeloma

Limited/suggestive evidence of an association

  • Cancers of the lung, bronchus, and trachea (windpipe)
  • Cancer of the larynx (voice box)
  • Prostate cancer
  • Multiple myeloma
  • Bladder cancer

These categories provide a framework for US government policy decisions regarding compensation for US Vietnam veterans (see below).

Can Vietnam veterans be tested for Agent Orange exposure?

No widely available lab tests can show if someone was exposed to Agent Orange in the past. Because of this, the Department of Veterans Affairs (VA) presumes that all veterans who served in certain places at certain times might have been exposed, and therefore might be eligible for benefits for certain medical conditions considered to be service-related disabilities. 

Benefits for exposed veterans

Vietnam veterans and those who served in certain other locations (such as Thailand or the Korean Demilitarized Zone) and were exposed to Agent Orange or other herbicides may be eligible for 3 kinds of benefits.

Agent Orange Registry health exam: The Agent Orange Registry is a program administered by the VA since 1978. Veterans who qualify and participate in this program receive a free medical exam, lab tests, and specialty referrals, if appropriate. Veterans do not need to enroll in the VA health care system to receive the registry exam.

Disability compensation: Disability compensation payments are available for veterans with certain service-related illnesses, including some types of cancer. The amount of the monthly payment is determined by the extent of disability.

The cancers considered by the US government as related to Agent Orange exposure correspond closely to the cancers found by the NASEM report to have “sufficient” or “limited/suggestive” evidence of an association:

Veterans with cancers not on this list can still file for disability benefits, although they’ll need to submit more supporting evidence for the claim.

Some conditions other than cancer are also considered related to Agent Orange exposure.

Medical benefits: Some veterans could qualify for medical care after being exposed to Agent Orange. The VA provides medical care at VA facilities, prescription medicines, and home health and hospice care to veterans with conditions linked with herbicide exposure in Vietnam. These include the cancers presumed to be Agent Orange-related, listed above.

To learn if you might be eligible for these benefits, call the Department of Veterans Affairs at 1-800-749-8387 or visit their website at:

Other things veterans can do for their health

Be sure your doctor knows if you have been exposed to Agent Orange. Because of the possibility of increased cancer risk, your doctor might advise you to get certain cancer screening tests and to promptly report any suspicious symptoms.

Of course, veterans are at risk for many types of cancer just like everyone else, even if they haven’t been exposed to Agent Orange. You can lower your risk of cancer (and other diseases) by not smoking, staying at a healthy weight, getting regular physical activity, and eating a healthy diet (including avoiding or limiting alcohol).

If you are concerned about having been exposed to Agent Orange, you may want to join a support group online or through your local VA hospital. 

To learn more

Along with the American Cancer Society, other sources of information and support include:

Department of Veterans Affairs
Toll-free numbers:
Special Health Issues: 1-800-749-8387
Benefits (including disability compensation): 1-800-827-1000
Information on Agent Orange:

Vietnam Veterans of America
Toll-free number: 1-800-882-1316 (1-800-VVA-1316)
Information on Agent Orange:

National Academies of Sciences, Engineering, and Medicine
Veterans and Agent Orange - Update 11 (2018):

The American Cancer Society medical and editorial content team

Our team is made up of doctors and oncology certified nurses with deep knowledge of cancer care as well as editors and translators with extensive experience in medical writing.

Agency for Toxic Substances and Disease Registry. ToxFAQs for Chlorinated Dibenzo-p-dioxins (CDDs). 2011. Accessed at on February 9, 2023.

Frumkin H. Agent Orange and cancer: An overview for clinicians. CA Canc J Clin. 2003;53:245-255. Accessed at on February 9, 2023.

International Agency for Research on Cancer (IARC). IARC Monographs on the Evaluation of Carcinogenic Risks to Humans. Volume 100F. A Review of Human Carcinogens: Chemical Agents and Related Occupations. 2012. Accessed at on February 9, 2023.

National Academies of Sciences, Engineering, and Medicine. Veterans and Agent Orange: Update 11 (2018). Washington, DC: National Academies Press, 2018. Accessed at on February 9, 2023.

US Department of Health and Human Services. Public Health Service, National Toxicology Program. Report on Carcinogens, Fifteenth Edition: 2,3,7,8-Tetrachlorodibenzo-p-dioxin. 2021. Accessed at on February 9, 2023.

US Department of Veterans Affairs. Facts about Herbicides. Accessed at on February 9, 2023.


Last Revised: February 13, 2023

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