Dozens of people who believed the masts trigger symptoms such as anxiety, nausea and tiredness could not detect if signals were on or off in trials.
But when they thought the signal was on they reported more distress, suggesting the problem has a psychological basis.
However, the Environmental Health Perspectives study stressed people were nonetheless suffering "real symptoms".
"Belief is a very powerful thing," said Professor Elaine Fox, of the University of Essex, who led the three year study.
"If you really believe something is going to do you some harm, it will."
The study was funded by the Mobile Telecommunications and Health Research programme, a body which is itself funded by industry and government.
I just wanted to draw attention to 'placebo'.
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