What's the current state of knowledge concerning health risks caused by Bluetooth headsets?
What has been confirmed so far?
I lack the expertise to evaluate which reports are trustworthy and which are not.
Additionally, some people may suffer from hypersensitivity to the microwave radio frequencies, causing them to get headaches just from turning a phone on or being in a room with someone on a phone or headset. According to the United States Food and Drug Administration, the US Federal Communications Commission, and the United Kingdom National Radiological Protection Board, all available scientific research shows that mobile devices are safe, but further research is necessary. (Source)