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Do Cell Phones Cause Brain Cancer?

By Andrew Weil, M.D.

Question: I was alarmed to hear that the World Health Organization has concluded that cell phones can cause brain cancer. So many people depend on their mobile phones. What should we do?

Reply: Not so fast. The World Health Organization hasn't concluded anything yet on this issue, but its International Agency for Research on Cancer (IARC) has just classified radio-frequency electromagnetic fields from cell phones as "possibly carcinogenic to humans." This occurred after a working group of 31 scientists from 14 countries reviewed available research, including some not yet published, and found "limited evidence" of a positive association between cell phone usage and glioma, a type of malignant brain tumor. While the group found the association "credible," it could not rule out that "chance, bias or confounding" could be responsible for the findings. In other words, the group saw a "possible" link between cell phone usage and gliomas but didn't view the association as strong enough to be considered "probable." It has not concluded that cell phone emissions cause cancer in humans.

The chairman of the Working Group, Jonathan Samet, M.D., M.S., of the University of Southern California, stressed the need for more research, especially on the long-term, heavy use of mobile phones, and suggested that in the meantime consumers can take such precautions as texting or using hands-free devices in order to reduce their exposure.

Because brain tumors take many years to develop, we may not know for some time whether or not cell phone use really is associated with these malignancies. In the meantime, I think it makes sense to implement the precautions I've recommended in the past:

To eliminate the most immediate danger of cell phone use to yourself and others, don't talk or text while driving.

Andrew Weil, M.D., is a world-renowned leader and pioneer in the field of integrative medicine, a healing oriented approach to health care which encompasses body, mind, and spirit.

Combining a Harvard education and a lifetime of practicing natural and preventive medicine, Dr. Weil is the founder and director of the Arizona Center for Integrative Medicine (AzCIM) at the University of Arizona Health Sciences Center, in Tucson, where he is also a Clinical Professor of Medicine and Professor of Public Health and the Lovell-Jones Professor of Integrative Rheumatology. Dr. Weil received both his medical degree and his undergraduate AB degree in biology (botany) from Harvard University.

Dr. Weil is an internationally-recognized expert for his views on leading a healthy lifestyle, his philosophy of healthy aging, and his critique of the future of medicine and health care. Approximately 10 million copies of Dr. Weil's books have been sold, including Spontaneous Healing and Why Our Health Matters.

Online, he is the editorial director of, the leading web resource for healthy living based on the philosophy of integrative medicine. He can be found on Facebook at, Twitter at, and Dr. Weil's Daily Health Tips blog at

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