- In one study that followed more than 420,000 cellphone users over a 20-year period, researchers found no evidence of a link between cellphones and brain tumors.
- Another study found an association between cellphones and cancer of the salivary glands. However, only a small number of study participants had malignant tumors.
- Another study suggested a possible increased risk of glioma — a specific type of brain tumor — for the heaviest cellphone users, but no increase in brain tumor risk overall.
The possible connection between cellphones and cancer is controversial. Many years’ worth of studies on cellphones and cancer have yielded conflicting results. Currently, there’s no consensus about the degree of cancer risk — if any — posed by cellphone use. The primary concern with cellphones and cancer seems to be the development of brain tumors associated with cellphone use. Some research suggests a slight increase in the rate of brain tumors since the 1970s, but cellphones weren’t in use during the 1970s. Instead, the subtle increases are more likely related to other factors — such as increased access to medical care and improvements in diagnostic imaging.