A recent review of studies assessed whether there was epidemiologic evidence for an association between long-term cell phone usage and the risk of developing a brain tumor.
In order to be included in the analysis, studies were required to have been published in a peer-reviewed journal, included participants who had used cell phone for 10 or more years, and analyzed the side of the brain tumor relative to the side of the head preferred for cell phone usage. Eleven long-term epidemiologic studies fit the criteria.
The results indicated that using a cell phone for 10 or more years approximately doubles the risk of being diagnosed with a brain tumor on the same side of the head as that preferred for cell phone use.