Factfinder Tool - Cancer FactFinder

CLAIM: Root canals cause cancer

What you may have heard Bacteria left behind during a root canal procedure can release toxins into the bloodstream and lead to cancer. This idea has gained attention through online forums and alternative health documentaries. What the science tells us Root canals are not linked to cancer. This myth originated from a discredited theory over…

CLAIM: Epstein-Barr virus causes cancer

Medical Issue or Treatment

Definitely or most likely true

What you may have heard People who have or have had Epstein-Barr virus are at an increased risk of developing certain cancers. What the science tells us Epstein-Barr virus (EBV) is the infection that causes mononucleosis. According to the CDC, 9 out of 10 adults have antibodies showing that they have or have had EBV…

Gloved hand holding test tube that says "Epstein-Barr Virus (EBV) Test" hovering over racks of test tubes

CLAIM: HPV vaccines cause cancer

Medical Issue or Treatment

Definitely or most likely not true

What you may have heard Claims have circulated on social media suggesting that the Human Papillomavirus (HPV) vaccine, Gardasil 9, causes cancer. These claims often stem from general vaccine misinformation and misunderstandings about how the vaccine works. In fact, the HPV vaccine is highly effective in preventing cancer. What the science tells us Gardasil was…

Vials of vaccine for Human Papilloma Virus with a syringe

CLAIM: Chronic Stress can increase chance of cancer

Lifestyle Medical Issue or Treatment

Impact on cancer risk undetermined

What you may have heard Some people believe that chronic stress can lead to cancer. The idea is that stress affects the body’s defenses and may make it easier for cancer to develop. What science tells us Stress triggers changes in hormones and the immune system. Long-term stress can increase inflammation and alter how cells…

CLAIM: CT scans cause cancer

Medical Issue or Treatment

Impact on cancer risk undetermined

What you may have heard Some people believe that getting CT scans can increase the chance of developing cancer. They point to the higher radiation dose from CT scans compared to regular X-rays as a reason for concern. What science tells us CT scanners use ionizing radiation, which can damage DNA. While most cells repair…

CLAIM: Vitamin D supplements may reduce the risk of advanced cancer

Medical Issue or Treatment

Impact on cancer risk undetermined

What you may have heard Higher levels of vitamin D can reduce cancer mortality and prevent cancer from becoming advanced. What science tells us Emerging research indicates that vitamin D might play a role in cancer prevention and management. However, the evidence is mixed, and further studies are needed to fully understand its impact. Clinical…

Vitamin D gel tablets spilling out of a white bottle

CLAIM: Sound Waves

Consumer products Medical Issue or Treatment

Impact on cancer risk undetermined

What you may have heard Noninvasive sound waves can break down tumors and prevent cancer from spreading without harmful side effects. What science tells us Histotripsy is a technique that uses targeted ultrasound waves to break down tumors. Developed at the University of Michigan, this method focuses high-energy ultrasound waves to form microbubbles within the…

Electromagnetic waves for Rife Machine entry

CLAIM: Rife Machines Can Cure Cancer

Consumer products Medical Issue or Treatment

Definitely or most likely not true

What you may have heard The Rife machine can cure cancer by using electromagnetic frequencies that target and destroy cancer cells. What science tells us The Rife machine, developed by Royal Raymond Rife in the 1920s, is a device that generates low electromagnetic energy waves, similar to radio waves. Proponents claim that these waves can…

CLAIM: Fenbendazole, a drug used to deworm dogs, can cure cancer

Medical Issue or Treatment

Impact on cancer risk undetermined

What you may have heard Fenbendazole (a drug used to deworm dogs), cured a patient with small cell lung cancer. What the science tells us Both the FDA and EMA prohibit the use of fenbendazole in humans due to potential toxicity and teratogenic effects. The recommended dosage for animals is significantly higher than the acceptable…

A close-up photo of a dog's face for the entry on Fenbendazole, a dog-dewormer drug

CLAIM: COVID-19 vaccines cause cancer

Medical Issue or Treatment

Definitely or most likely not true

What you may have heard COVID-19 vaccines can cause cancer or increase the aggressiveness of existing cancers. What the science tells us The overwhelming body of scientific evidence indicates that COVID-19 vaccines are safe and do not cause cancer. Major health organizations and multiple studies support this conclusion. Epidemiological Evidence: Laboratory Evidence/Supporting Evidence: IARC Carcinogen…

CLAIM: Cannabis oil can cure cancer

Lifestyle Medical Issue or Treatment

Definitely or most likely not true

What you may have heard Cannabis oil is a natural cure for cancer. What the science tells us Cannabis oil, extracted from the cannabis sativa plant, can be found in various products such as oils, roll-ons, vaping solutions, and edibles. It contains cannabidiol (CBD), which, unlike THC (another component of cannabis), does not affect the…

CLAIM: Lack of sleep increases your risk of cancer

Lifestyle Medical Issue or Treatment

Definitely or most likely true

What you may have heard A disrupted sleep cycle reduces our body’s ability to function properly and decreases its ability to ward off cancer (Shafi et al.). What science tells us The World Health Organization (WHO) states that circadian disruption alone is a risk factor for cancer.“Circadian disruption” is defined as any change in sleep…

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