evidence: This concern may even intensify when you do a quick internet search. There are websites that claim that using Bluetooth headphones can cause cancer, infertility, and brain issues. [...] Because Bluetooth emits energy just like phones do, it is also a source of radiation. This radiation is specifically called electromagnetic radiation (EMR). [...] Despite being worn in the ear, Bluetooth devices don’t induce any significant change in cochlear nerve activity. Despite their close proximity to the brain, the associated risk of Bluetooth headphones to cancer and other brain ailments remains unbacked by evidence.