Mobile handsets work in the microwave band of radio waves. These waves emanating from your phone can cause headaches similar to migraine headaches especially in power users. Bluetooth technology uses very high frequency waves which do not cause any of these problems. However ill fitting Bluetooth headsets may cause headache/ earaches which is why you must select a comfortable one at the time of purchase to avoid regretting your hasty decision later.

there is no convincing evidence of any harmful effects of Bluetooth headsets or ear phones when used with average volume levels. even radiation induced injury to ear is not proved beyond doubt. to be safe you can continue using headset whenever required and avoid overusing it as further studies are being carried out about long term effects of these devices and results of these studies will confirm