The short answer
DDT is a pesticide banned in many countries but still persistent in the environment. It is classified as probably carcinogenic, with suspected links to liver cancer and lymphoma. Exposure today is mainly through low-level food residues.
DDT is classified as a probable human carcinogen (IARC Group 2A).
People are mainly exposed by low-level residues in food, since most uses are banned.
It is most strongly linked to suspected links to liver cancer and lymphoma.
A carcinogen classification describes hazard — whether something can cause cancer — not your personal risk at a given exposure.
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The full explanation.
The simple version
DDT is a pesticide once used widely against insects and malaria-carrying mosquitoes. It was banned in many countries decades ago because it builds up in the environment and wildlife. It is classified as a probable carcinogen, and exposure today is much lower than in the past.
What ddt is
DDT (dichlorodiphenyltrichloroethane) is a long-lasting pesticide. It was banned for agricultural use in the U.S. in 1972 and in many countries since, though it is still used in some places to control malaria. Because it breaks down slowly, traces remain in soil, water, and the food chain.
How people are exposed
Common ways people come into contact with it:
- Low-level residues in some foods, especially fatty foods and fish
- Living in areas where DDT is still used for disease control
- Historical occupational and agricultural exposure
The cancer connection
IARC links DDT most closely to liver cancer, and it is also associated with non-Hodgkin lymphoma and testicular cancer. The evidence in people is limited.
The International Agency for Research on Cancer (IARC), the cancer arm of the World Health Organization, places ddt in Group 2A, probably carcinogenic to humans — meaning the evidence in people is limited but there is strong support from animal or mechanistic studies (evaluated in 2015). In the United States, the National Toxicology Program's Report on Carcinogens lists it as reasonably anticipated to be a human carcinogen.
Hazard is not the same as risk
It helps to separate two ideas that are easy to mix up: hazard and risk. When an agency lists ddt as a carcinogen, it is making a statement about hazard — whether the substance is capable of causing cancer under some conditions. It is not, by itself, a statement about your personal risk, which depends on how much you are exposed to, for how long, and other factors. Two substances in the same group can carry very different real-world risks. The label answers "can it cause cancer?" — not "how likely is it to cause cancer for me?"
How to lower your exposure
- Eat a varied diet; trim fat from fish and meat to reduce stored residues
- Rely on bans that have sharply cut exposure over time
- Follow local guidance in areas where DDT is still used
If you are looking at your overall cancer risk, small, steady steps add up. See our overview of cancer prevention and what raises cancer risk to put any single exposure in context.
The bottom line
DDT is a probable human carcinogen (IARC Group 2A). The most important thing you can do is understand where exposure comes from and take reasonable steps to reduce it, without losing sleep over a single label. Focus your energy on the biggest, most controllable risks in your own life.
Words to know
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Common questions
▸Does ddt cause cancer?
Probably. DDT is classified as a probable human carcinogen: the evidence in people is limited, but animal and laboratory studies support a link. "Probable" means suspected on solid grounds, not proven.
▸How are people exposed to ddt?
Most exposure happens by low-level residues in food, since most uses are banned.
▸Which cancers are linked to ddt?
It is most strongly linked to suspected links to liver cancer and lymphoma.
▸How can I reduce my exposure to ddt?
The main steps are a varied diet and the bans that have reduced exposure.
▸Does a carcinogen label mean I will get cancer?
No. A classification is about hazard — whether ddt 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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