signals. This was the only change noted among more than 20 

variables compared.(3) 

In a study of 209 brain tumor cases and 425 matched controls, 

there was no increased risk of brain tumors associated with 

mobile phone use. When tumors did exist in certain locations, 

however, they were more likely to be on the side of the head 

where the mobile phone was used. Because this occurred in only 

a small number of cases, the increased likelihood was too small 

to be statistically significant.(4) 

(FDA)

In summary, we do not have enough information at this point to 

assure the public that there are, or are not, any low incident 

health problems associated with use of mobile phones. FDA 

continues to work with all parties, including other federal 

agencies and industry, to assure that research is undertaken to 

provide the necessary answers to the outstanding questions 

about the safety of mobile phones. 

What is known about cases of human cancer that 

have been reported in users of hand held mobile 

phones?

ealth and Safety Information H

Some people who have used mobile phones have been 

diagnosed with brain cancer. But it is important to understand 

that this type of cancer also occurs among people who have not 

tional di used mobile phones. In fact, brain cancer occurs in the U.S. 

dA

population at a rate of about 6 new cases per 100,000 people 

each year. At that rate, assuming 80 million users of mobile 

phones (a number increasing at a rate of about 1 million per 

month), about 4800 cases of brain cancer would be expected 

each year among those 80 million people, whether or not they 

used their phones. Thus it is not possible to tell whether any 

individual s cancer arose because of the phone, or whether it 

would have happened anyway. A key question is whether the risk 

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